Rust - Generate EPCIS 1.2 XML With Sample Codes

Processing a considerable number of large XML files may require a lot of memory and processing power. With Rust, we can create applications that process huge XML files with a relatively small memory footprint yet are still performant. This post shows how to generate simple EPCIS 1.2 XML using Rust.

Rust Requirements To Write Out EPCIS 1.2 XML

We used the following items for this post.

Rust 1.52.1
Cargo
Rust Crates
- xml-rs 0.8.3
  - For writing XML files
- uuid 0.8.2
  - For generating unique identifiers
- chrono 0.4.19
  - For date/time-related elements
Intellij IDEA
Rust plugin for Intellij IDEA

Target EPCIS 1.2 XML Output

We aim to create the following EPCIS 1.2 XML using Rust and some crates.

<?xml version="1.0" encoding="utf-8"?>
<epcis:EPCISDocument xmlns:cbvmda="urn:epcglobal:cbv:mda" xmlns:epcis="urn:epcglobal:epcis:xsd:1" 
xmlns:sbdh="http://www.unece.org/cefact/namespaces/StandardBusinessDocumentHeader" 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
creationDate="2016-11-08T02:05:22Z" schemaVersion="1.2">
  <EPCISHeader>
    <sbdh:StandardBusinessDocumentHeader>
      <sbdh:HeaderVersion>1.0</sbdh:HeaderVersion>
      <sbdh:Sender>
        <sbdh:Identifier Authority="GLN">00000000</sbdh:Identifier>
      </sbdh:Sender>
      <sbdh:Receiver>
        <sbdh:Identifier Authority="GLN">11111111</sbdh:Identifier>
      </sbdh:Receiver>
      <sbdh:DocumentIdentification>
        <sbdh:Standard>EPCGlobal</sbdh:Standard>
        <sbdh:TypeVersion>1.0</sbdh:TypeVersion>
        <sbdh:InstanceIdentifier>0a59e4fc-3b79-459e-9512-732a89a60ccc</sbdh:InstanceIdentifier>
        <sbdh:Type>Events</sbdh:Type>
        <sbdh:CreationDateAndTime>2019-10-19T16:33:49.341Z</sbdh:CreationDateAndTime>
      </sbdh:DocumentIdentification>
    </sbdh:StandardBusinessDocumentHeader>
  </EPCISHeader>
  <EPCISBody>
    <EventList>
      <ObjectEvent>
        <eventTime>2019-10-19T16:33:49.342Z</eventTime>
        <eventTimeZoneOffset>+08:00</eventTimeZoneOffset>
        <epcList>
          <epc>urn:epc:id:sgtin:0999999.000005.100333338641</epc>
        </epcList>
        <action>ADD</action>
        <bizStep>urn:epcglobal:cbv:bizstep:commissioning</bizStep>
        <disposition>urn:epcglobal:cbv:disp:active</disposition>
        <readPoint>
          <id>urn:epc:id:sgln:0000000.00000.0</id>
        </readPoint>
        <bizLocation>
          <id>urn:epc:id:sgln:0000000.00000.0</id>
        </bizLocation>
        <extension>
          <ilmd>
            <cbvmda:lotNumber>22222</cbvmda:lotNumber>
            <cbvmda:itemExpirationDate>2022-03-12</cbvmda:itemExpirationDate>
          </ilmd>
        </extension>
      </ObjectEvent>
    </EventList>
  </EPCISBody>
</epcis:EPCISDocument>

<?xml version="1.0" encoding="utf-8"?>

<epcis:EPCISDocument xmlns:cbvmda="urn:epcglobal:cbv:mda" xmlns:epcis="urn:epcglobal:epcis:xsd:1"

xmlns:sbdh="http://www.unece.org/cefact/namespaces/StandardBusinessDocumentHeader"

xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

creationDate="2016-11-08T02:05:22Z" schemaVersion="1.2">

<sbdh:StandardBusinessDocumentHeader>

<sbdh:HeaderVersion>1.0</sbdh:HeaderVersion>

<sbdh:Sender>

<sbdh:Identifier Authority="GLN">00000000</sbdh:Identifier>

</sbdh:Sender>

<sbdh:Receiver>

<sbdh:Identifier Authority="GLN">11111111</sbdh:Identifier>

</sbdh:Receiver>

<sbdh:DocumentIdentification>

<sbdh:Standard>EPCGlobal</sbdh:Standard>

<sbdh:TypeVersion>1.0</sbdh:TypeVersion>

<sbdh:InstanceIdentifier>0a59e4fc-3b79-459e-9512-732a89a60ccc</sbdh:InstanceIdentifier>

<sbdh:Type>Events</sbdh:Type>

<sbdh:CreationDateAndTime>2019-10-19T16:33:49.341Z</sbdh:CreationDateAndTime>

</sbdh:DocumentIdentification>

</sbdh:StandardBusinessDocumentHeader>

</EPCISHeader>

<epc>urn:epc:id:sgtin:0999999.000005.100333338641</epc>

</epcList>

<bizStep>urn:epcglobal:cbv:bizstep:commissioning</bizStep>

<disposition>urn:epcglobal:cbv:disp:active</disposition>

</readPoint>

</bizLocation>

<ilmd>

<cbvmda:lotNumber>22222</cbvmda:lotNumber>

<cbvmda:itemExpirationDate>2022-03-12</cbvmda:itemExpirationDate>

</ilmd>

</extension>

</ObjectEvent>

</EventList>

</EPCISBody>

</epcis:EPCISDocument>

Writing out XML using Closure

This post also demonstrates how effective the solution described in A Convenient Way to Write Out Start and End XML Tags using Closure is, especially for large XML data.

Update Rust Cargo.toml With Dependencies

After creating a project in IntelliJ IDEA, we update the cargo.toml as follows.

[package]
name = "RustGenerateEPCIS1_2XML"
version = "0.1.0"
authors = ["Karl San Gabriel <karl.sangabriel@gmail.com>"]
edition = "2018"

# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html

[dependencies]
xml-rs = "0.8.3"
uuid = { version = "0.8.2", features = ["v4"] }
chrono = "0.4.19"

[package]

name = "RustGenerateEPCIS1_2XML"

version = "0.1.0"

authors = ["Karl San Gabriel <karl.sangabriel@gmail.com>"]

edition = "2018"

# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html

[dependencies]

xml-rs = "0.8.3"

uuid = { version = "0.8.2", features = ["v4"] }

chrono = "0.4.19"

Create Rust Codes To Write Out EPCIS 1.2 XML File

First, we create the main.rs and import the stuff we need.

use chrono::prelude::*;
use uuid::Uuid;
use std::fs::File;
use std::io::{self, Write};
use xml::writer::{EventWriter, EmitterConfig, XmlEvent, Result};
use std::collections::HashMap;
use xml::writer::events::StartElementBuilder;

use chrono::prelude::*;

use uuid::Uuid;

use std::fs::File;

use std::io::{self, Write};

use xml::writer::{EventWriter, EmitterConfig, XmlEvent, Result};

use std::collections::HashMap;

use xml::writer::events::StartElementBuilder;

Then, create a helper function that converts String to &str. We need this function for some string conversion because some functions from xml-rs expect some parameters of type &str instead of String.

fn string_to_static_str(s: String) -> &'static str {
    Box::leak(s.into_boxed_str())
}

fn string_to_static_str(s: String) -> &'static str {

Box::leak(s.into_boxed_str())

}

Then, we create our “convenient” function that writes out an XML element as a block. It uses a closure to allow for nested XML element blocks, i.e., a block within a block.

fn  write_element_block <W: Write, F: Fn(&mut EventWriter<W>)>(element: &str, 
     ns: Option<HashMap<String, String>>, 
     attr: Option<HashMap<String, String>>, w: &mut EventWriter<W>, f: F) -> Result<()>  {

    let mut event_builder: StartElementBuilder =  XmlEvent::start_element(element);

    if ns.is_some() {
        for (k, v) in ns.unwrap().iter() {
            event_builder = event_builder.ns(string_to_static_str(k.clone()), string_to_static_str(v.clone()));
        }
    }

    if attr.is_some() {
        for (k, v) in attr.unwrap().iter() {
            event_builder = event_builder.attr(string_to_static_str(k.clone()), string_to_static_str(v.clone()));
        }
    }

    let mut event: XmlEvent = event_builder.into();
    w.write(event);
    f(w);
    event = XmlEvent::end_element().into();
    return w.write(event);
}

fn write_element_block <W: Write, F: Fn(&mut EventWriter<W>)>(element: &str,

ns: Option<HashMap<String, String>>,

attr: Option<HashMap<String, String>>, w: &mut EventWriter<W>, f: F) -> Result<()> {

let mut event_builder: StartElementBuilder = XmlEvent::start_element(element);

if ns.is_some() {

for (k, v) in ns.unwrap().iter() {

event_builder = event_builder.ns(string_to_static_str(k.clone()), string_to_static_str(v.clone()));

}

if attr.is_some() {

for (k, v) in attr.unwrap().iter() {

event_builder = event_builder.attr(string_to_static_str(k.clone()), string_to_static_str(v.clone()));

}

let mut event: XmlEvent = event_builder.into();

w.write(event);

f(w);

event = XmlEvent::end_element().into();

return w.write(event);

}

Then, we create another function that calls the write_element_block to build up that EPCIS 1.2 XML content.

fn handle_event<W: Write>(w: &mut EventWriter<W>) -> Result<()> {

    let mut ns_map:HashMap<String, String> = HashMap::new();

    let utc: DateTime<Utc> = Utc::now();
    ns_map.insert("creationDate".to_string(), utc.to_rfc3339_opts(SecondsFormat::Millis, true));
    ns_map.insert("schemaVersion".to_string(), "1.2".to_string());

    let mut attr_map: HashMap<String, String> = HashMap::new();

    attr_map.insert("epcis".to_string(), "urn:epcglobal:epcis:xsd:1".to_string());
    attr_map.insert("cbvmda".to_string(), "urn:epcglobal:cbv:mda".to_string());
    attr_map.insert("sbdh".to_string(), "http://www.unece.org/cefact/namespaces/StandardBusinessDocumentHeader".to_string());
    attr_map.insert("xsi".to_string(), "http://www.w3.org/2001/XMLSchema-instance".to_string());

    return write_element_block("epcis:EPCISDocument", Some(ns_map), Some(attr_map), w, |w| {

        write_element_block("EPCISHeader", None, None, w, |w| {
            write_element_block("sbdh:StandardBusinessDocumentHeader", None, None, w, |w| {
                write_element_block("sbdh:HeaderVersion", None, None, w, |w| {
                    let mut event: XmlEvent = XmlEvent::Characters("1.0").into();
                    w.write(event);
                });
                write_element_block("sbdh:Sender", None, None, w, |w| {
                    let mut hash_map = HashMap::new();
                    hash_map.insert("Authority".to_string(), "GLN".to_string());


                    write_element_block("sbdh:Identifier", None, Some(hash_map), w, |w| {
                        let mut event: XmlEvent = XmlEvent::Characters("00000000").into();
                        w.write(event);
                    });
                });

                write_element_block("sbdh:Receiver", None, None, w, |w| {
                    let mut hash_map = HashMap::new();
                    hash_map.insert("Authority".to_string(), "GLN".to_string());


                    write_element_block("sbdh:Identifier", Some(hash_map), None, w, |w| {
                        let mut event: XmlEvent = XmlEvent::Characters("11111111").into();
                        w.write(event);
                    });
                });

                write_element_block("sbdh:DocumentIdentification", None, None, w, |w| {
                    write_element_block("sbdh:Standard", None, None, w, |w| {
                        let mut event: XmlEvent = XmlEvent::Characters("EPCGlobal").into();
                        w.write(event);
                    });

                    write_element_block("sbdh:TypeVersion", None, None,w, |w| {
                        let mut event: XmlEvent = XmlEvent::Characters("1.0").into();
                        w.write(event);
                    });

                    write_element_block("sbdh:InstanceIdentifier", None, None,w, |w| {
                        let mut event: XmlEvent = XmlEvent::Characters(
                            string_to_static_str(Uuid::new_v4().to_hyphenated().to_string())
                        ).into();
                        w.write(event);
                    });

                    write_element_block("sbdh:Type", None, None,w, |w| {
                        let mut event: XmlEvent = XmlEvent::Characters("Events").into();
                        w.write(event);
                    });

                    write_element_block("sbdh:CreationDateAndTime", None, None,w, |w| {

                        // E.g., 2016-11-08T02:05:22Z
                        let utc: DateTime<Utc> = Utc::now();
                        let mut event: XmlEvent = XmlEvent::Characters(string_to_static_str(
                                       utc.to_rfc3339_opts(SecondsFormat::Millis, true))).into();
                        w.write(event);
                    });
                });
            });
        });

        write_element_block("EPCISBody", None, None, w, |w| {
            write_element_block("EventList", None, None,w, |w| {
                // Normally, we'd loop through a list of object to write out ObjectEvent
                write_element_block("ObjectEvent", None, None, w, |w| {
                    write_element_block("eventTime", None, None,w, |w| {
                        // This is usually not the current date/time
                        let utc: DateTime<Utc> = Utc::now();
                        let mut event: XmlEvent = XmlEvent::Characters(string_to_static_str(
                                       utc.to_rfc3339_opts(SecondsFormat::Millis, true))).into();
                        w.write(event);
                    });

                    write_element_block("eventTimeZoneOffset", None, None,w, |w| {

                        // This is usually not the current date/time's offset
                        let local: DateTime<Local> = Local::now();
                        let mut event: XmlEvent = XmlEvent::Characters(string_to_static_str(local.offset().to_string())).into();
                        w.write(event);
                    });

                    write_element_block("epcList", None, None,w, |w| {
                        // Normally, we'd loop through a list of object to write out epc
                        write_element_block("epc", None, None, w, |w| {
                            let mut event: XmlEvent = XmlEvent::Characters(
                                          "urn:epc:id:sgtin:0999999.000005.100333338641").into();
                            w.write(event);
                        });
                    });
                    write_element_block("action", None, None,w, |w| {
                        let mut event: XmlEvent = XmlEvent::Characters("ADD").into();
                        w.write(event);
                    });
                    write_element_block("bizStep", None, None, w, |w| {
                        let mut event: XmlEvent = XmlEvent::Characters("urn:epcglobal:cbv:bizstep:commissioning").into();
                        w.write(event);
                    });

                    write_element_block("disposition", None, None,w, |w| {
                        let mut event: XmlEvent = XmlEvent::Characters("urn:epcglobal:cbv:disp:active").into();
                        w.write(event);
                    });

                    write_element_block("readPoint", None, None,w, |w| {
                        write_element_block("id", None, None, w, |w| {
                            let mut event: XmlEvent = XmlEvent::Characters("urn:epc:id:sgln:0000000.00000.0").into();
                            w.write(event);
                        });
                    });

                    write_element_block("bizLocation", None, None, w, |w| {
                        write_element_block("id", None, None, w, |w| {
                            let mut event: XmlEvent = XmlEvent::Characters("urn:epc:id:sgln:0000000.00000.0").into();
                            w.write(event);
                        });
                    });

                    write_element_block("extension", None, None, w, |w| {
                        write_element_block("ilmd", None, None, w, |w| {
                            write_element_block("cbvmda:lotNumber", None, None,w, |w| {
                                let mut event: XmlEvent = XmlEvent::Characters("22222").into();
                                w.write(event);
                            });
                            write_element_block("cbvmda:itemExpirationDate", None, None, w, |w| {
                                let mut event: XmlEvent = XmlEvent::Characters("2022-03-12").into();
                                w.write(event);
                            });
                        });
                    });
                });

                // Other events include AggregationEvent, TransformationEvent, and TransactionEvent
            });
        });
    });
}

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fn handle_event<W: Write>(w: &mut EventWriter<W>) -> Result<()> {

let mut ns_map:HashMap<String, String> = HashMap::new();

let utc: DateTime<Utc> = Utc::now();

ns_map.insert("creationDate".to_string(), utc.to_rfc3339_opts(SecondsFormat::Millis, true));

ns_map.insert("schemaVersion".to_string(), "1.2".to_string());

let mut attr_map: HashMap<String, String> = HashMap::new();

attr_map.insert("epcis".to_string(), "urn:epcglobal:epcis:xsd:1".to_string());

attr_map.insert("cbvmda".to_string(), "urn:epcglobal:cbv:mda".to_string());

attr_map.insert("sbdh".to_string(), "http://www.unece.org/cefact/namespaces/StandardBusinessDocumentHeader".to_string());

attr_map.insert("xsi".to_string(), "http://www.w3.org/2001/XMLSchema-instance".to_string());

return write_element_block("epcis:EPCISDocument", Some(ns_map), Some(attr_map), w, |w| {

write_element_block("EPCISHeader", None, None, w, |w| {

write_element_block("sbdh:StandardBusinessDocumentHeader", None, None, w, |w| {

write_element_block("sbdh:HeaderVersion", None, None, w, |w| {

let mut event: XmlEvent = XmlEvent::Characters("1.0").into();

w.write(event);

});

write_element_block("sbdh:Sender", None, None, w, |w| {

let mut hash_map = HashMap::new();

hash_map.insert("Authority".to_string(), "GLN".to_string());

write_element_block("sbdh:Identifier", None, Some(hash_map), w, |w| {

let mut event: XmlEvent = XmlEvent::Characters("00000000").into();

w.write(event);

});

write_element_block("sbdh:Receiver", None, None, w, |w| {

let mut hash_map = HashMap::new();

hash_map.insert("Authority".to_string(), "GLN".to_string());

write_element_block("sbdh:Identifier", Some(hash_map), None, w, |w| {

let mut event: XmlEvent = XmlEvent::Characters("11111111").into();

w.write(event);

});

write_element_block("sbdh:DocumentIdentification", None, None, w, |w| {

write_element_block("sbdh:Standard", None, None, w, |w| {

let mut event: XmlEvent = XmlEvent::Characters("EPCGlobal").into();

w.write(event);

});

write_element_block("sbdh:TypeVersion", None, None,w, |w| {

let mut event: XmlEvent = XmlEvent::Characters("1.0").into();

w.write(event);

});

write_element_block("sbdh:InstanceIdentifier", None, None,w, |w| {

let mut event: XmlEvent = XmlEvent::Characters(

string_to_static_str(Uuid::new_v4().to_hyphenated().to_string())

).into();

w.write(event);

});

write_element_block("sbdh:Type", None, None,w, |w| {

let mut event: XmlEvent = XmlEvent::Characters("Events").into();

w.write(event);

});

write_element_block("sbdh:CreationDateAndTime", None, None,w, |w| {

// E.g., 2016-11-08T02:05:22Z

let utc: DateTime<Utc> = Utc::now();

let mut event: XmlEvent = XmlEvent::Characters(string_to_static_str(

utc.to_rfc3339_opts(SecondsFormat::Millis, true))).into();

w.write(event);

});

write_element_block("EPCISBody", None, None, w, |w| {

write_element_block("EventList", None, None,w, |w| {

// Normally, we'd loop through a list of object to write out ObjectEvent

write_element_block("ObjectEvent", None, None, w, |w| {

write_element_block("eventTime", None, None,w, |w| {

// This is usually not the current date/time

let utc: DateTime<Utc> = Utc::now();

let mut event: XmlEvent = XmlEvent::Characters(string_to_static_str(

utc.to_rfc3339_opts(SecondsFormat::Millis, true))).into();

w.write(event);

});

write_element_block("eventTimeZoneOffset", None, None,w, |w| {

// This is usually not the current date/time's offset

let local: DateTime<Local> = Local::now();

let mut event: XmlEvent = XmlEvent::Characters(string_to_static_str(local.offset().to_string())).into();

w.write(event);

});

write_element_block("epcList", None, None,w, |w| {

// Normally, we'd loop through a list of object to write out epc

write_element_block("epc", None, None, w, |w| {

let mut event: XmlEvent = XmlEvent::Characters(

"urn:epc:id:sgtin:0999999.000005.100333338641").into();

w.write(event);

});

write_element_block("action", None, None,w, |w| {

let mut event: XmlEvent = XmlEvent::Characters("ADD").into();

w.write(event);

});

write_element_block("bizStep", None, None, w, |w| {

let mut event: XmlEvent = XmlEvent::Characters("urn:epcglobal:cbv:bizstep:commissioning").into();

w.write(event);

});

write_element_block("disposition", None, None,w, |w| {

let mut event: XmlEvent = XmlEvent::Characters("urn:epcglobal:cbv:disp:active").into();

w.write(event);

});

write_element_block("readPoint", None, None,w, |w| {

write_element_block("id", None, None, w, |w| {

let mut event: XmlEvent = XmlEvent::Characters("urn:epc:id:sgln:0000000.00000.0").into();

w.write(event);

});

write_element_block("bizLocation", None, None, w, |w| {

write_element_block("id", None, None, w, |w| {

let mut event: XmlEvent = XmlEvent::Characters("urn:epc:id:sgln:0000000.00000.0").into();

w.write(event);

});

write_element_block("extension", None, None, w, |w| {

write_element_block("ilmd", None, None, w, |w| {

write_element_block("cbvmda:lotNumber", None, None,w, |w| {

let mut event: XmlEvent = XmlEvent::Characters("22222").into();

w.write(event);

});

write_element_block("cbvmda:itemExpirationDate", None, None, w, |w| {

let mut event: XmlEvent = XmlEvent::Characters("2022-03-12").into();

w.write(event);

});

// Other events include AggregationEvent, TransformationEvent, and TransactionEvent

});

}

Finally, we code the function main function as follows.

fn main() {
    let mut file = File::create("epcis_1dot2_output.xml").unwrap();
    let mut writer = EmitterConfig::new().perform_indent(true).create_writer(&mut file);
    handle_event(&mut writer);
}

fn main() {

let mut file = File::create("epcis_1dot2_output.xml").unwrap();

let mut writer = EmitterConfig::new().perform_indent(true).create_writer(&mut file);

handle_event(&mut writer);

}

When we run this Rust program, it first creates an XML file. Then, it makes a writer so our functions handle_event can use to write out each XML block building up the target EPCIS 1.2 XML file.

The codes generate the following output on the console.

C:/Users/karldev/.cargo/bin/cargo.exe run --color=always --package RustGenerateEPCIS1_2XML --bin RustGenerateEPCIS1_2XML
warning: unused import: `self`
 --> src\main.rs:4:15
  |
4 | use std::io::{self, Write};
  |               ^^^^
  |
  = note: `#[warn(unused_imports)]` on by default

warning: variable does not need to be mutable
  --> src\main.rs:58:25
   |
58 |                     let mut event: XmlEvent = XmlEvent::Characters("1.0").into();
   |                         ----^^^^^
   |                         |
   |                         help: remove this `mut`
   |
   = note: `#[warn(unused_mut)]` on by default

warning: variable does not need to be mutable
  --> src\main.rs:67:29
   |
67 |                         let mut event: XmlEvent = XmlEvent::Characters("00000000").into();
   |                             ----^^^^^
   |                             |
   |                             help: remove this `mut`

warning: variable does not need to be mutable
  --> src\main.rs:78:29
   |
78 |                         let mut event: XmlEvent = XmlEvent::Characters("11111111").into();
   |                             ----^^^^^
   |                             |
   |                             help: remove this `mut`

warning: variable does not need to be mutable
  --> src\main.rs:85:29
   |
85 |                         let mut event: XmlEvent = XmlEvent::Characters("EPCGlobal").into();
   |                             ----^^^^^
   |                             |
   |                             help: remove this `mut`

warning: variable does not need to be mutable
  --> src\main.rs:90:29
   |
90 |                         let mut event: XmlEvent = XmlEvent::Characters("1.0").into();
   |                             ----^^^^^
   |                             |
   |                             help: remove this `mut`

warning: variable does not need to be mutable
  --> src\main.rs:95:29
   |
95 |                         let mut event: XmlEvent = XmlEvent::Characters(
   |                             ----^^^^^
   |                             |
   |                             help: remove this `mut`

warning: variable does not need to be mutable
   --> src\main.rs:102:29
    |
102 |                         let mut event: XmlEvent = XmlEvent::Characters("Events").into();
    |                             ----^^^^^
    |                             |
    |                             help: remove this `mut`

warning: variable does not need to be mutable
   --> src\main.rs:110:29
    |
110 |                         let mut event: XmlEvent = XmlEvent::Characters(string_to_static_str(
    |                             ----^^^^^
    |                             |
    |                             help: remove this `mut`

warning: variable does not need to be mutable
   --> src\main.rs:125:29
    |
125 |                         let mut event: XmlEvent = XmlEvent::Characters(string_to_static_str(
    |                             ----^^^^^
    |                             |
    |                             help: remove this `mut`

warning: variable does not need to be mutable
   --> src\main.rs:134:29
    |
134 |                         let mut event: XmlEvent = XmlEvent::Characters(string_to_static_str(local.offset().to_string())).into();
    |                             ----^^^^^
    |                             |
    |                             help: remove this `mut`

warning: variable does not need to be mutable
   --> src\main.rs:141:33
    |
141 | ...                   let mut event: XmlEvent = XmlEvent::Characters(
    |                           ----^^^^^
    |                           |
    |                           help: remove this `mut`

warning: variable does not need to be mutable
   --> src\main.rs:147:29
    |
147 |                         let mut event: XmlEvent = XmlEvent::Characters("ADD").into();
    |                             ----^^^^^
    |                             |
    |                             help: remove this `mut`

warning: variable does not need to be mutable
   --> src\main.rs:151:29
    |
151 |                         let mut event: XmlEvent = XmlEvent::Characters("urn:epcglobal:cbv:bizstep:commissioning").into();
    |                             ----^^^^^
    |                             |
    |                             help: remove this `mut`

warning: variable does not need to be mutable
   --> src\main.rs:156:29
    |
156 |                         let mut event: XmlEvent = XmlEvent::Characters("urn:epcglobal:cbv:disp:active").into();
    |                             ----^^^^^
    |                             |
    |                             help: remove this `mut`

warning: variable does not need to be mutable
   --> src\main.rs:162:33
    |
162 | ...                   let mut event: XmlEvent = XmlEvent::Characters("urn:epc:id:sgln:0000000.00000.0").into();
    |                           ----^^^^^
    |                           |
    |                           help: remove this `mut`

warning: variable does not need to be mutable
   --> src\main.rs:169:33
    |
169 | ...                   let mut event: XmlEvent = XmlEvent::Characters("urn:epc:id:sgln:0000000.00000.0").into();
    |                           ----^^^^^
    |                           |
    |                           help: remove this `mut`

warning: variable does not need to be mutable
   --> src\main.rs:177:37
    |
177 | ...                   let mut event: XmlEvent = XmlEvent::Characters("22222").into();
    |                           ----^^^^^
    |                           |
    |                           help: remove this `mut`

warning: variable does not need to be mutable
   --> src\main.rs:181:37
    |
181 | ...                   let mut event: XmlEvent = XmlEvent::Characters("2022-03-12").into();
    |                           ----^^^^^
    |                           |
    |                           help: remove this `mut`

warning: crate `RustGenerateEPCIS1_2XML` should have a snake case name
  |
  = note: `#[warn(non_snake_case)]` on by default
  = help: convert the identifier to snake case: `rust_generate_epcis1_2_xml`

warning: unused `Result` that must be used
  --> src\main.rs:32:5
   |
32 |     w.write(event);
   |     ^^^^^^^^^^^^^^^
   |
   = note: `#[warn(unused_must_use)]` on by default
   = note: this `Result` may be an `Err` variant, which should be handled

warning: unused `Result` that must be used
   --> src\main.rs:55:9
    |
55  | /         write_element_block("EPCISHeader", None, None, w, |w| {
56  | |             write_element_block("sbdh:StandardBusinessDocumentHeader", None, None, w, |w| {
57  | |                 write_element_block("sbdh:HeaderVersion", None, None, w, |w| {
58  | |                     let mut event: XmlEvent = XmlEvent::Characters("1.0").into();
...   |
115 | |             });
116 | |         });
    | |___________^
    |
    = note: this `Result` may be an `Err` variant, which should be handled

warning: unused `Result` that must be used
   --> src\main.rs:56:13
    |
56  | /             write_element_block("sbdh:StandardBusinessDocumentHeader", None, None, w, |w| {
57  | |                 write_element_block("sbdh:HeaderVersion", None, None, w, |w| {
58  | |                     let mut event: XmlEvent = XmlEvent::Characters("1.0").into();
59  | |                     w.write(event);
...   |
114 | |                 });
115 | |             });
    | |_______________^
    |
    = note: this `Result` may be an `Err` variant, which should be handled

warning: unused `Result` that must be used
  --> src\main.rs:57:17
   |
57 | /                 write_element_block("sbdh:HeaderVersion", None, None, w, |w| {
58 | |                     let mut event: XmlEvent = XmlEvent::Characters("1.0").into();
59 | |                     w.write(event);
60 | |                 });
   | |___________________^
   |
   = note: this `Result` may be an `Err` variant, which should be handled

warning: unused `Result` that must be used
  --> src\main.rs:59:21
   |
59 |                     w.write(event);
   |                     ^^^^^^^^^^^^^^^
   |
   = note: this `Result` may be an `Err` variant, which should be handled

warning: unused `Result` that must be used
  --> src\main.rs:61:17
   |
61 | /                 write_element_block("sbdh:Sender", None, None, w, |w| {
62 | |                     let mut hash_map = HashMap::new();
63 | |                     hash_map.insert("Authority".to_string(), "GLN".to_string());
64 | |
...  |
69 | |                     });
70 | |                 });
   | |___________________^
   |
   = note: this `Result` may be an `Err` variant, which should be handled

warning: unused `Result` that must be used
  --> src\main.rs:66:21
   |
66 | /                     write_element_block("sbdh:Identifier", None, Some(hash_map), w, |w| {
67 | |                         let mut event: XmlEvent = XmlEvent::Characters("00000000").into();
68 | |                         w.write(event);
69 | |                     });
   | |_______________________^
   |
   = note: this `Result` may be an `Err` variant, which should be handled

warning: unused `Result` that must be used
  --> src\main.rs:68:25
   |
68 |                         w.write(event);
   |                         ^^^^^^^^^^^^^^^
   |
   = note: this `Result` may be an `Err` variant, which should be handled

warning: unused `Result` that must be used
  --> src\main.rs:72:17
   |
72 | /                 write_element_block("sbdh:Receiver", None, None, w, |w| {
73 | |                     let mut hash_map = HashMap::new();
74 | |                     hash_map.insert("Authority".to_string(), "GLN".to_string());
75 | |
...  |
80 | |                     });
81 | |                 });
   | |___________________^
   |
   = note: this `Result` may be an `Err` variant, which should be handled

warning: unused `Result` that must be used
  --> src\main.rs:77:21
   |
77 | /                     write_element_block("sbdh:Identifier", Some(hash_map), None, w, |w| {
78 | |                         let mut event: XmlEvent = XmlEvent::Characters("11111111").into();
79 | |                         w.write(event);
80 | |                     });
   | |_______________________^
   |
   = note: this `Result` may be an `Err` variant, which should be handled

warning: unused `Result` that must be used
  --> src\main.rs:79:25
   |
79 |                         w.write(event);
   |                         ^^^^^^^^^^^^^^^
   |
   = note: this `Result` may be an `Err` variant, which should be handled

warning: unused `Result` that must be used
   --> src\main.rs:83:17
    |
83  | /                 write_element_block("sbdh:DocumentIdentification", None, None, w, |w| {
84  | |                     write_element_block("sbdh:Standard", None, None, w, |w| {
85  | |                         let mut event: XmlEvent = XmlEvent::Characters("EPCGlobal").into();
86  | |                         w.write(event);
...   |
113 | |                     });
114 | |                 });
    | |___________________^
    |
    = note: this `Result` may be an `Err` variant, which should be handled

warning: unused `Result` that must be used
  --> src\main.rs:84:21
   |
84 | /                     write_element_block("sbdh:Standard", None, None, w, |w| {
85 | |                         let mut event: XmlEvent = XmlEvent::Characters("EPCGlobal").into();
86 | |                         w.write(event);
87 | |                     });
   | |_______________________^
   |
   = note: this `Result` may be an `Err` variant, which should be handled

warning: unused `Result` that must be used
  --> src\main.rs:86:25
   |
86 |                         w.write(event);
   |                         ^^^^^^^^^^^^^^^
   |
   = note: this `Result` may be an `Err` variant, which should be handled

warning: unused `Result` that must be used
  --> src\main.rs:89:21
   |
89 | /                     write_element_block("sbdh:TypeVersion", None, None,w, |w| {
90 | |                         let mut event: XmlEvent = XmlEvent::Characters("1.0").into();
91 | |                         w.write(event);
92 | |                     });
   | |_______________________^
   |
   = note: this `Result` may be an `Err` variant, which should be handled

warning: unused `Result` that must be used
  --> src\main.rs:91:25
   |
91 |                         w.write(event);
   |                         ^^^^^^^^^^^^^^^
   |
   = note: this `Result` may be an `Err` variant, which should be handled

warning: unused `Result` that must be used
  --> src\main.rs:94:21
   |
94 | /                     write_element_block("sbdh:InstanceIdentifier", None, None,w, |w| {
95 | |                         let mut event: XmlEvent = XmlEvent::Characters(
96 | |                             string_to_static_str(Uuid::new_v4().to_hyphenated().to_string())
97 | |                         ).into();
98 | |                         w.write(event);
99 | |                     });
   | |_______________________^
   |
   = note: this `Result` may be an `Err` variant, which should be handled

warning: unused `Result` that must be used
  --> src\main.rs:98:25
   |
98 |                         w.write(event);
   |                         ^^^^^^^^^^^^^^^
   |
   = note: this `Result` may be an `Err` variant, which should be handled

warning: unused `Result` that must be used
   --> src\main.rs:101:21
    |
101 | /                     write_element_block("sbdh:Type", None, None,w, |w| {
102 | |                         let mut event: XmlEvent = XmlEvent::Characters("Events").into();
103 | |                         w.write(event);
104 | |                     });
    | |_______________________^
    |
    = note: this `Result` may be an `Err` variant, which should be handled

warning: unused `Result` that must be used
   --> src\main.rs:103:25
    |
103 |                         w.write(event);
    |                         ^^^^^^^^^^^^^^^
    |
    = note: this `Result` may be an `Err` variant, which should be handled

warning: unused `Result` that must be used
   --> src\main.rs:106:21
    |
106 | /                     write_element_block("sbdh:CreationDateAndTime", None, None,w, |w| {
107 | |
108 | |                         // E.g., 2016-11-08T02:05:22Z
109 | |                         let utc: DateTime<Utc> = Utc::now();
...   |
112 | |                         w.write(event);
113 | |                     });
    | |_______________________^
    |
    = note: this `Result` may be an `Err` variant, which should be handled

warning: unused `Result` that must be used
   --> src\main.rs:112:25
    |
112 |                         w.write(event);
    |                         ^^^^^^^^^^^^^^^
    |
    = note: this `Result` may be an `Err` variant, which should be handled

warning: unused `Result` that must be used
   --> src\main.rs:118:9
    |
118 | /         write_element_block("EPCISBody", None, None, w, |w| {
119 | |             write_element_block("EventList", None, None,w, |w| {
120 | |                 // Normally, we'd loop through a list of object to write out ObjectEvent
121 | |                 write_element_block("ObjectEvent", None, None, w, |w| {
...   |
189 | |             });
190 | |         });
    | |___________^
    |
    = note: this `Result` may be an `Err` variant, which should be handled

warning: unused `Result` that must be used
   --> src\main.rs:119:13
    |
119 | /             write_element_block("EventList", None, None,w, |w| {
120 | |                 // Normally, we'd loop through a list of object to write out ObjectEvent
121 | |                 write_element_block("ObjectEvent", None, None, w, |w| {
122 | |                     write_element_block("eventTime", None, None,w, |w| {
...   |
188 | |                 // Other events include AggregationEvent, TransformationEvent, and TransactionEvent
189 | |             });
    | |_______________^
    |
    = note: this `Result` may be an `Err` variant, which should be handled

warning: unused `Result` that must be used
   --> src\main.rs:121:17
    |
121 | /                 write_element_block("ObjectEvent", None, None, w, |w| {
122 | |                     write_element_block("eventTime", None, None,w, |w| {
123 | |                         // This is usually not the current date/time
124 | |                         let utc: DateTime<Utc> = Utc::now();
...   |
185 | |                     });
186 | |                 });
    | |___________________^
    |
    = note: this `Result` may be an `Err` variant, which should be handled

warning: unused `Result` that must be used
   --> src\main.rs:122:21
    |
122 | /                     write_element_block("eventTime", None, None,w, |w| {
123 | |                         // This is usually not the current date/time
124 | |                         let utc: DateTime<Utc> = Utc::now();
125 | |                         let mut event: XmlEvent = XmlEvent::Characters(string_to_static_str(
126 | |                             utc.to_rfc3339_opts(SecondsFormat::Millis, true))).into();
127 | |                         w.write(event);
128 | |                     });
    | |_______________________^
    |
    = note: this `Result` may be an `Err` variant, which should be handled

warning: unused `Result` that must be used
   --> src\main.rs:127:25
    |
127 |                         w.write(event);
    |                         ^^^^^^^^^^^^^^^
    |
    = note: this `Result` may be an `Err` variant, which should be handled

warning: unused `Result` that must be used
   --> src\main.rs:130:21
    |
130 | /                     write_element_block("eventTimeZoneOffset", None, None,w, |w| {
131 | |
132 | |                         // This is usually not the current date/time's offset
133 | |                         let local: DateTime<Local> = Local::now();
134 | |                         let mut event: XmlEvent = XmlEvent::Characters(string_to_static_str(local.offset().to_string())).into();
135 | |                         w.write(event);
136 | |                     });
    | |_______________________^
    |
    = note: this `Result` may be an `Err` variant, which should be handled

warning: unused `Result` that must be used
   --> src\main.rs:135:25
    |
135 |                         w.write(event);
    |                         ^^^^^^^^^^^^^^^
    |
    = note: this `Result` may be an `Err` variant, which should be handled

warning: unused `Result` that must be used
   --> src\main.rs:138:21
    |
138 | /                     write_element_block("epcList", None, None,w, |w| {
139 | |                         // Normally, we'd loop through a list of object to write out epc
140 | |                         write_element_block("epc", None, None, w, |w| {
141 | |                             let mut event: XmlEvent = XmlEvent::Characters(
...   |
144 | |                         });
145 | |                     });
    | |_______________________^
    |
    = note: this `Result` may be an `Err` variant, which should be handled

warning: unused `Result` that must be used
   --> src\main.rs:140:25
    |
140 | /                         write_element_block("epc", None, None, w, |w| {
141 | |                             let mut event: XmlEvent = XmlEvent::Characters(
142 | |                                 "urn:epc:id:sgtin:0999999.000005.100333338641").into();
143 | |                             w.write(event);
144 | |                         });
    | |___________________________^
    |
    = note: this `Result` may be an `Err` variant, which should be handled

warning: unused `Result` that must be used
   --> src\main.rs:143:29
    |
143 | ...                   w.write(event);
    |                       ^^^^^^^^^^^^^^^
    |
    = note: this `Result` may be an `Err` variant, which should be handled

warning: unused `Result` that must be used
   --> src\main.rs:146:21
    |
146 | /                     write_element_block("action", None, None,w, |w| {
147 | |                         let mut event: XmlEvent = XmlEvent::Characters("ADD").into();
148 | |                         w.write(event);
149 | |                     });
    | |_______________________^
    |
    = note: this `Result` may be an `Err` variant, which should be handled

warning: unused `Result` that must be used
   --> src\main.rs:148:25
    |
148 |                         w.write(event);
    |                         ^^^^^^^^^^^^^^^
    |
    = note: this `Result` may be an `Err` variant, which should be handled

warning: unused `Result` that must be used
   --> src\main.rs:150:21
    |
150 | /                     write_element_block("bizStep", None, None, w, |w| {
151 | |                         let mut event: XmlEvent = XmlEvent::Characters("urn:epcglobal:cbv:bizstep:commissioning").into();
152 | |                         w.write(event);
153 | |                     });
    | |_______________________^
    |
    = note: this `Result` may be an `Err` variant, which should be handled

warning: unused `Result` that must be used
   --> src\main.rs:152:25
    |
152 |                         w.write(event);
    |                         ^^^^^^^^^^^^^^^
    |
    = note: this `Result` may be an `Err` variant, which should be handled

warning: unused `Result` that must be used
   --> src\main.rs:155:21
    |
155 | /                     write_element_block("disposition", None, None,w, |w| {
156 | |                         let mut event: XmlEvent = XmlEvent::Characters("urn:epcglobal:cbv:disp:active").into();
157 | |                         w.write(event);
158 | |                     });
    | |_______________________^
    |
    = note: this `Result` may be an `Err` variant, which should be handled

warning: unused `Result` that must be used
   --> src\main.rs:157:25
    |
157 |                         w.write(event);
    |                         ^^^^^^^^^^^^^^^
    |
    = note: this `Result` may be an `Err` variant, which should be handled

warning: unused `Result` that must be used
   --> src\main.rs:160:21
    |
160 | /                     write_element_block("readPoint", None, None,w, |w| {
161 | |                         write_element_block("id", None, None, w, |w| {
162 | |                             let mut event: XmlEvent = XmlEvent::Characters("urn:epc:id:sgln:0000000.00000.0").into();
163 | |                             w.write(event);
164 | |                         });
165 | |                     });
    | |_______________________^
    |
    = note: this `Result` may be an `Err` variant, which should be handled

warning: unused `Result` that must be used
   --> src\main.rs:161:25
    |
161 | /                         write_element_block("id", None, None, w, |w| {
162 | |                             let mut event: XmlEvent = XmlEvent::Characters("urn:epc:id:sgln:0000000.00000.0").into();
163 | |                             w.write(event);
164 | |                         });
    | |___________________________^
    |
    = note: this `Result` may be an `Err` variant, which should be handled

warning: unused `Result` that must be used
   --> src\main.rs:163:29
    |
163 | ...                   w.write(event);
    |                       ^^^^^^^^^^^^^^^
    |
    = note: this `Result` may be an `Err` variant, which should be handled

warning: unused `Result` that must be used
   --> src\main.rs:167:21
    |
167 | /                     write_element_block("bizLocation", None, None, w, |w| {
168 | |                         write_element_block("id", None, None, w, |w| {
169 | |                             let mut event: XmlEvent = XmlEvent::Characters("urn:epc:id:sgln:0000000.00000.0").into();
170 | |                             w.write(event);
171 | |                         });
172 | |                     });
    | |_______________________^
    |
    = note: this `Result` may be an `Err` variant, which should be handled

warning: unused `Result` that must be used
   --> src\main.rs:168:25
    |
168 | /                         write_element_block("id", None, None, w, |w| {
169 | |                             let mut event: XmlEvent = XmlEvent::Characters("urn:epc:id:sgln:0000000.00000.0").into();
170 | |                             w.write(event);
171 | |                         });
    | |___________________________^
    |
    = note: this `Result` may be an `Err` variant, which should be handled

warning: unused `Result` that must be used
   --> src\main.rs:170:29
    |
170 | ...                   w.write(event);
    |                       ^^^^^^^^^^^^^^^
    |
    = note: this `Result` may be an `Err` variant, which should be handled

warning: unused `Result` that must be used
   --> src\main.rs:174:21
    |
174 | /                     write_element_block("extension", None, None, w, |w| {
175 | |                         write_element_block("ilmd", None, None, w, |w| {
176 | |                             write_element_block("cbvmda:lotNumber", None, None,w, |w| {
177 | |                                 let mut event: XmlEvent = XmlEvent::Characters("22222").into();
...   |
184 | |                         });
185 | |                     });
    | |_______________________^
    |
    = note: this `Result` may be an `Err` variant, which should be handled

warning: unused `Result` that must be used
   --> src\main.rs:175:25
    |
175 | /                         write_element_block("ilmd", None, None, w, |w| {
176 | |                             write_element_block("cbvmda:lotNumber", None, None,w, |w| {
177 | |                                 let mut event: XmlEvent = XmlEvent::Characters("22222").into();
178 | |                                 w.write(event);
...   |
183 | |                             });
184 | |                         });
    | |___________________________^
    |
    = note: this `Result` may be an `Err` variant, which should be handled

warning: unused `Result` that must be used
   --> src\main.rs:176:29
    |
176 | / ...                   write_element_block("cbvmda:lotNumber", None, None,w, |w| {
177 | | ...                       let mut event: XmlEvent = XmlEvent::Characters("22222").into();
178 | | ...                       w.write(event);
179 | | ...                   });
    | |_________________________^
    |
    = note: this `Result` may be an `Err` variant, which should be handled

warning: unused `Result` that must be used
   --> src\main.rs:178:33
    |
178 | ...                   w.write(event);
    |                       ^^^^^^^^^^^^^^^
    |
    = note: this `Result` may be an `Err` variant, which should be handled

warning: unused `Result` that must be used
   --> src\main.rs:180:29
    |
180 | / ...                   write_element_block("cbvmda:itemExpirationDate", None, None, w, |w| {
181 | | ...                       let mut event: XmlEvent = XmlEvent::Characters("2022-03-12").into();
182 | | ...                       w.write(event);
183 | | ...                   });
    | |_________________________^
    |
    = note: this `Result` may be an `Err` variant, which should be handled

warning: unused `Result` that must be used
   --> src\main.rs:182:33
    |
182 | ...                   w.write(event);
    |                       ^^^^^^^^^^^^^^^
    |
    = note: this `Result` may be an `Err` variant, which should be handled

warning: unused `Result` that must be used
   --> src\main.rs:197:5
    |
197 |     handle_event(&mut writer);
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = note: this `Result` may be an `Err` variant, which should be handled

warning: 71 warnings emitted

    Finished dev [unoptimized + debuginfo] target(s) in 0.24s
     Running `target\debug\RustGenerateEPCIS1_2XML.exe`

Process finished with exit code 0

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C:/Users/karldev/.cargo/bin/cargo.exe run --color=always --package RustGenerateEPCIS1_2XML --bin RustGenerateEPCIS1_2XML

warning: unused import: `self`

--> src\main.rs:4:15

4 | use std::io::{self, Write};

| ^^^^

= note: `#[warn(unused_imports)]` on by default

warning: variable does not need to be mutable

--> src\main.rs:58:25

58 | let mut event: XmlEvent = XmlEvent::Characters("1.0").into();

| ----^^^^^

| |

| help: remove this `mut`

= note: `#[warn(unused_mut)]` on by default

warning: variable does not need to be mutable

--> src\main.rs:67:29

67 | let mut event: XmlEvent = XmlEvent::Characters("00000000").into();

| ----^^^^^

| |

| help: remove this `mut`

warning: variable does not need to be mutable

--> src\main.rs:78:29

78 | let mut event: XmlEvent = XmlEvent::Characters("11111111").into();

| ----^^^^^

| |

| help: remove this `mut`

warning: variable does not need to be mutable

--> src\main.rs:85:29

85 | let mut event: XmlEvent = XmlEvent::Characters("EPCGlobal").into();

| ----^^^^^

| |

| help: remove this `mut`

warning: variable does not need to be mutable

--> src\main.rs:90:29

90 | let mut event: XmlEvent = XmlEvent::Characters("1.0").into();

| ----^^^^^

| |

| help: remove this `mut`

warning: variable does not need to be mutable

--> src\main.rs:95:29

95 | let mut event: XmlEvent = XmlEvent::Characters(

| ----^^^^^

| |

| help: remove this `mut`

warning: variable does not need to be mutable

--> src\main.rs:102:29

102 | let mut event: XmlEvent = XmlEvent::Characters("Events").into();

| ----^^^^^

| |

| help: remove this `mut`

warning: variable does not need to be mutable

--> src\main.rs:110:29

110 | let mut event: XmlEvent = XmlEvent::Characters(string_to_static_str(

| ----^^^^^

| |

| help: remove this `mut`

warning: variable does not need to be mutable

--> src\main.rs:125:29

125 | let mut event: XmlEvent = XmlEvent::Characters(string_to_static_str(

| ----^^^^^

| |

| help: remove this `mut`

warning: variable does not need to be mutable

--> src\main.rs:134:29

134 | let mut event: XmlEvent = XmlEvent::Characters(string_to_static_str(local.offset().to_string())).into();

| ----^^^^^

| |

| help: remove this `mut`

warning: variable does not need to be mutable

--> src\main.rs:141:33

141 | ... let mut event: XmlEvent = XmlEvent::Characters(

| ----^^^^^

| |

| help: remove this `mut`

warning: variable does not need to be mutable

--> src\main.rs:147:29

147 | let mut event: XmlEvent = XmlEvent::Characters("ADD").into();

| ----^^^^^

| |

| help: remove this `mut`

warning: variable does not need to be mutable

--> src\main.rs:151:29

151 | let mut event: XmlEvent = XmlEvent::Characters("urn:epcglobal:cbv:bizstep:commissioning").into();

| ----^^^^^

| |

| help: remove this `mut`

warning: variable does not need to be mutable

--> src\main.rs:156:29

156 | let mut event: XmlEvent = XmlEvent::Characters("urn:epcglobal:cbv:disp:active").into();

| ----^^^^^

| |

| help: remove this `mut`

warning: variable does not need to be mutable

--> src\main.rs:162:33

162 | ... let mut event: XmlEvent = XmlEvent::Characters("urn:epc:id:sgln:0000000.00000.0").into();

| ----^^^^^

| |

| help: remove this `mut`

warning: variable does not need to be mutable

--> src\main.rs:169:33

169 | ... let mut event: XmlEvent = XmlEvent::Characters("urn:epc:id:sgln:0000000.00000.0").into();

| ----^^^^^

| |

| help: remove this `mut`

warning: variable does not need to be mutable

--> src\main.rs:177:37

177 | ... let mut event: XmlEvent = XmlEvent::Characters("22222").into();

| ----^^^^^

| |

| help: remove this `mut`

warning: variable does not need to be mutable

--> src\main.rs:181:37

181 | ... let mut event: XmlEvent = XmlEvent::Characters("2022-03-12").into();

| ----^^^^^

| |

| help: remove this `mut`

warning: crate `RustGenerateEPCIS1_2XML` should have a snake case name

= note: `#[warn(non_snake_case)]` on by default

= help: convert the identifier to snake case: `rust_generate_epcis1_2_xml`

warning: unused `Result` that must be used

--> src\main.rs:32:5

32 | w.write(event);

| ^^^^^^^^^^^^^^^

= note: `#[warn(unused_must_use)]` on by default

= note: this `Result` may be an `Err` variant, which should be handled

warning: unused `Result` that must be used

--> src\main.rs:55:9

55 | / write_element_block("EPCISHeader", None, None, w, |w| {

56 | | write_element_block("sbdh:StandardBusinessDocumentHeader", None, None, w, |w| {

57 | | write_element_block("sbdh:HeaderVersion", None, None, w, |w| {

58 | | let mut event: XmlEvent = XmlEvent::Characters("1.0").into();

... |

115 | | });

116 | | });

| |___________^

= note: this `Result` may be an `Err` variant, which should be handled

warning: unused `Result` that must be used

--> src\main.rs:56:13

56 | / write_element_block("sbdh:StandardBusinessDocumentHeader", None, None, w, |w| {

57 | | write_element_block("sbdh:HeaderVersion", None, None, w, |w| {

58 | | let mut event: XmlEvent = XmlEvent::Characters("1.0").into();

59 | | w.write(event);

... |

114 | | });

115 | | });

| |_______________^

= note: this `Result` may be an `Err` variant, which should be handled

warning: unused `Result` that must be used

--> src\main.rs:57:17

57 | / write_element_block("sbdh:HeaderVersion", None, None, w, |w| {

58 | | let mut event: XmlEvent = XmlEvent::Characters("1.0").into();

59 | | w.write(event);

60 | | });

| |___________________^

= note: this `Result` may be an `Err` variant, which should be handled

warning: unused `Result` that must be used

--> src\main.rs:59:21

59 | w.write(event);

| ^^^^^^^^^^^^^^^

= note: this `Result` may be an `Err` variant, which should be handled

warning: unused `Result` that must be used

--> src\main.rs:61:17

61 | / write_element_block("sbdh:Sender", None, None, w, |w| {

62 | | let mut hash_map = HashMap::new();

63 | | hash_map.insert("Authority".to_string(), "GLN".to_string());

64 | |

... |

69 | | });

70 | | });

| |___________________^

= note: this `Result` may be an `Err` variant, which should be handled

warning: unused `Result` that must be used

--> src\main.rs:66:21

66 | / write_element_block("sbdh:Identifier", None, Some(hash_map), w, |w| {

67 | | let mut event: XmlEvent = XmlEvent::Characters("00000000").into();

68 | | w.write(event);

69 | | });

| |_______________________^

= note: this `Result` may be an `Err` variant, which should be handled

warning: unused `Result` that must be used

--> src\main.rs:68:25

68 | w.write(event);

| ^^^^^^^^^^^^^^^

= note: this `Result` may be an `Err` variant, which should be handled

warning: unused `Result` that must be used

--> src\main.rs:72:17

72 | / write_element_block("sbdh:Receiver", None, None, w, |w| {

73 | | let mut hash_map = HashMap::new();

74 | | hash_map.insert("Authority".to_string(), "GLN".to_string());

75 | |

... |

80 | | });

81 | | });

| |___________________^

= note: this `Result` may be an `Err` variant, which should be handled

warning: unused `Result` that must be used

--> src\main.rs:77:21

77 | / write_element_block("sbdh:Identifier", Some(hash_map), None, w, |w| {

78 | | let mut event: XmlEvent = XmlEvent::Characters("11111111").into();

79 | | w.write(event);

80 | | });

| |_______________________^

= note: this `Result` may be an `Err` variant, which should be handled

warning: unused `Result` that must be used

--> src\main.rs:79:25

79 | w.write(event);

| ^^^^^^^^^^^^^^^

= note: this `Result` may be an `Err` variant, which should be handled

warning: unused `Result` that must be used

--> src\main.rs:83:17

83 | / write_element_block("sbdh:DocumentIdentification", None, None, w, |w| {

84 | | write_element_block("sbdh:Standard", None, None, w, |w| {

85 | | let mut event: XmlEvent = XmlEvent::Characters("EPCGlobal").into();

86 | | w.write(event);

... |

113 | | });

114 | | });

| |___________________^

= note: this `Result` may be an `Err` variant, which should be handled

warning: unused `Result` that must be used

--> src\main.rs:84:21

84 | / write_element_block("sbdh:Standard", None, None, w, |w| {

85 | | let mut event: XmlEvent = XmlEvent::Characters("EPCGlobal").into();

86 | | w.write(event);

87 | | });

| |_______________________^

= note: this `Result` may be an `Err` variant, which should be handled

warning: unused `Result` that must be used

--> src\main.rs:86:25

86 | w.write(event);

| ^^^^^^^^^^^^^^^

= note: this `Result` may be an `Err` variant, which should be handled

warning: unused `Result` that must be used

--> src\main.rs:89:21

89 | / write_element_block("sbdh:TypeVersion", None, None,w, |w| {

90 | | let mut event: XmlEvent = XmlEvent::Characters("1.0").into();

91 | | w.write(event);

92 | | });

| |_______________________^

= note: this `Result` may be an `Err` variant, which should be handled

warning: unused `Result` that must be used

--> src\main.rs:91:25

91 | w.write(event);

| ^^^^^^^^^^^^^^^

= note: this `Result` may be an `Err` variant, which should be handled

warning: unused `Result` that must be used

--> src\main.rs:94:21

94 | / write_element_block("sbdh:InstanceIdentifier", None, None,w, |w| {

95 | | let mut event: XmlEvent = XmlEvent::Characters(

96 | | string_to_static_str(Uuid::new_v4().to_hyphenated().to_string())

97 | | ).into();

98 | | w.write(event);

99 | | });

| |_______________________^

= note: this `Result` may be an `Err` variant, which should be handled

warning: unused `Result` that must be used

--> src\main.rs:98:25

98 | w.write(event);

| ^^^^^^^^^^^^^^^

= note: this `Result` may be an `Err` variant, which should be handled

warning: unused `Result` that must be used

--> src\main.rs:101:21

101 | / write_element_block("sbdh:Type", None, None,w, |w| {

102 | | let mut event: XmlEvent = XmlEvent::Characters("Events").into();

103 | | w.write(event);

104 | | });

| |_______________________^

= note: this `Result` may be an `Err` variant, which should be handled

warning: unused `Result` that must be used

--> src\main.rs:103:25

103 | w.write(event);

| ^^^^^^^^^^^^^^^

= note: this `Result` may be an `Err` variant, which should be handled

warning: unused `Result` that must be used

--> src\main.rs:106:21

106 | / write_element_block("sbdh:CreationDateAndTime", None, None,w, |w| {

107 | |

108 | | // E.g., 2016-11-08T02:05:22Z

109 | | let utc: DateTime<Utc> = Utc::now();

... |

112 | | w.write(event);

113 | | });

| |_______________________^

= note: this `Result` may be an `Err` variant, which should be handled

warning: unused `Result` that must be used

--> src\main.rs:112:25

112 | w.write(event);

| ^^^^^^^^^^^^^^^

= note: this `Result` may be an `Err` variant, which should be handled

warning: unused `Result` that must be used

--> src\main.rs:118:9

118 | / write_element_block("EPCISBody", None, None, w, |w| {

119 | | write_element_block("EventList", None, None,w, |w| {

120 | | // Normally, we'd loop through a list of object to write out ObjectEvent

121 | | write_element_block("ObjectEvent", None, None, w, |w| {

... |

189 | | });

190 | | });

| |___________^

= note: this `Result` may be an `Err` variant, which should be handled

warning: unused `Result` that must be used

--> src\main.rs:119:13

119 | / write_element_block("EventList", None, None,w, |w| {

120 | | // Normally, we'd loop through a list of object to write out ObjectEvent

121 | | write_element_block("ObjectEvent", None, None, w, |w| {

122 | | write_element_block("eventTime", None, None,w, |w| {

... |

188 | | // Other events include AggregationEvent, TransformationEvent, and TransactionEvent

189 | | });

| |_______________^

= note: this `Result` may be an `Err` variant, which should be handled

warning: unused `Result` that must be used

--> src\main.rs:121:17

121 | / write_element_block("ObjectEvent", None, None, w, |w| {

122 | | write_element_block("eventTime", None, None,w, |w| {

123 | | // This is usually not the current date/time

124 | | let utc: DateTime<Utc> = Utc::now();

... |

185 | | });

186 | | });

| |___________________^

= note: this `Result` may be an `Err` variant, which should be handled

warning: unused `Result` that must be used

--> src\main.rs:122:21

122 | / write_element_block("eventTime", None, None,w, |w| {

123 | | // This is usually not the current date/time

124 | | let utc: DateTime<Utc> = Utc::now();

125 | | let mut event: XmlEvent = XmlEvent::Characters(string_to_static_str(

126 | | utc.to_rfc3339_opts(SecondsFormat::Millis, true))).into();

127 | | w.write(event);

128 | | });

| |_______________________^

= note: this `Result` may be an `Err` variant, which should be handled

warning: unused `Result` that must be used

--> src\main.rs:127:25

127 | w.write(event);

| ^^^^^^^^^^^^^^^

= note: this `Result` may be an `Err` variant, which should be handled

warning: unused `Result` that must be used

--> src\main.rs:130:21

130 | / write_element_block("eventTimeZoneOffset", None, None,w, |w| {

131 | |

132 | | // This is usually not the current date/time's offset

133 | | let local: DateTime<Local> = Local::now();

134 | | let mut event: XmlEvent = XmlEvent::Characters(string_to_static_str(local.offset().to_string())).into();

135 | | w.write(event);

136 | | });

| |_______________________^

= note: this `Result` may be an `Err` variant, which should be handled

warning: unused `Result` that must be used

--> src\main.rs:135:25

135 | w.write(event);

| ^^^^^^^^^^^^^^^

= note: this `Result` may be an `Err` variant, which should be handled

warning: unused `Result` that must be used

--> src\main.rs:138:21

138 | / write_element_block("epcList", None, None,w, |w| {

139 | | // Normally, we'd loop through a list of object to write out epc

140 | | write_element_block("epc", None, None, w, |w| {

141 | | let mut event: XmlEvent = XmlEvent::Characters(

... |

144 | | });

145 | | });

| |_______________________^

= note: this `Result` may be an `Err` variant, which should be handled

warning: unused `Result` that must be used

--> src\main.rs:140:25

140 | / write_element_block("epc", None, None, w, |w| {

141 | | let mut event: XmlEvent = XmlEvent::Characters(

142 | | "urn:epc:id:sgtin:0999999.000005.100333338641").into();

143 | | w.write(event);

144 | | });

| |___________________________^

= note: this `Result` may be an `Err` variant, which should be handled

warning: unused `Result` that must be used

--> src\main.rs:143:29

143 | ... w.write(event);

| ^^^^^^^^^^^^^^^

= note: this `Result` may be an `Err` variant, which should be handled

warning: unused `Result` that must be used

--> src\main.rs:146:21

146 | / write_element_block("action", None, None,w, |w| {

147 | | let mut event: XmlEvent = XmlEvent::Characters("ADD").into();

148 | | w.write(event);

149 | | });

| |_______________________^

= note: this `Result` may be an `Err` variant, which should be handled

warning: unused `Result` that must be used

--> src\main.rs:148:25

148 | w.write(event);

| ^^^^^^^^^^^^^^^

= note: this `Result` may be an `Err` variant, which should be handled

warning: unused `Result` that must be used

--> src\main.rs:150:21

150 | / write_element_block("bizStep", None, None, w, |w| {

151 | | let mut event: XmlEvent = XmlEvent::Characters("urn:epcglobal:cbv:bizstep:commissioning").into();

152 | | w.write(event);

153 | | });

| |_______________________^

= note: this `Result` may be an `Err` variant, which should be handled

warning: unused `Result` that must be used

--> src\main.rs:152:25

152 | w.write(event);

| ^^^^^^^^^^^^^^^

= note: this `Result` may be an `Err` variant, which should be handled

warning: unused `Result` that must be used

--> src\main.rs:155:21

155 | / write_element_block("disposition", None, None,w, |w| {

156 | | let mut event: XmlEvent = XmlEvent::Characters("urn:epcglobal:cbv:disp:active").into();

157 | | w.write(event);

158 | | });

| |_______________________^

= note: this `Result` may be an `Err` variant, which should be handled

warning: unused `Result` that must be used

--> src\main.rs:157:25

157 | w.write(event);

| ^^^^^^^^^^^^^^^

= note: this `Result` may be an `Err` variant, which should be handled

warning: unused `Result` that must be used

--> src\main.rs:160:21

160 | / write_element_block("readPoint", None, None,w, |w| {

161 | | write_element_block("id", None, None, w, |w| {

162 | | let mut event: XmlEvent = XmlEvent::Characters("urn:epc:id:sgln:0000000.00000.0").into();

163 | | w.write(event);

164 | | });

165 | | });

| |_______________________^

= note: this `Result` may be an `Err` variant, which should be handled

warning: unused `Result` that must be used

--> src\main.rs:161:25

161 | / write_element_block("id", None, None, w, |w| {

162 | | let mut event: XmlEvent = XmlEvent::Characters("urn:epc:id:sgln:0000000.00000.0").into();

163 | | w.write(event);

164 | | });

| |___________________________^

= note: this `Result` may be an `Err` variant, which should be handled

warning: unused `Result` that must be used

--> src\main.rs:163:29

163 | ... w.write(event);

| ^^^^^^^^^^^^^^^

= note: this `Result` may be an `Err` variant, which should be handled

warning: unused `Result` that must be used

--> src\main.rs:167:21

167 | / write_element_block("bizLocation", None, None, w, |w| {

168 | | write_element_block("id", None, None, w, |w| {

169 | | let mut event: XmlEvent = XmlEvent::Characters("urn:epc:id:sgln:0000000.00000.0").into();

170 | | w.write(event);

171 | | });

172 | | });

| |_______________________^

= note: this `Result` may be an `Err` variant, which should be handled

warning: unused `Result` that must be used

--> src\main.rs:168:25

168 | / write_element_block("id", None, None, w, |w| {

169 | | let mut event: XmlEvent = XmlEvent::Characters("urn:epc:id:sgln:0000000.00000.0").into();

170 | | w.write(event);

171 | | });

| |___________________________^

= note: this `Result` may be an `Err` variant, which should be handled

warning: unused `Result` that must be used

--> src\main.rs:170:29

170 | ... w.write(event);

| ^^^^^^^^^^^^^^^

= note: this `Result` may be an `Err` variant, which should be handled

warning: unused `Result` that must be used

--> src\main.rs:174:21

174 | / write_element_block("extension", None, None, w, |w| {

175 | | write_element_block("ilmd", None, None, w, |w| {

176 | | write_element_block("cbvmda:lotNumber", None, None,w, |w| {

177 | | let mut event: XmlEvent = XmlEvent::Characters("22222").into();

... |

184 | | });

185 | | });

| |_______________________^

= note: this `Result` may be an `Err` variant, which should be handled

warning: unused `Result` that must be used

--> src\main.rs:175:25

175 | / write_element_block("ilmd", None, None, w, |w| {

176 | | write_element_block("cbvmda:lotNumber", None, None,w, |w| {

177 | | let mut event: XmlEvent = XmlEvent::Characters("22222").into();

178 | | w.write(event);

... |

183 | | });

184 | | });

| |___________________________^

= note: this `Result` may be an `Err` variant, which should be handled

warning: unused `Result` that must be used

--> src\main.rs:176:29

176 | / ... write_element_block("cbvmda:lotNumber", None, None,w, |w| {

177 | | ... let mut event: XmlEvent = XmlEvent::Characters("22222").into();

178 | | ... w.write(event);

179 | | ... });

| |_________________________^

= note: this `Result` may be an `Err` variant, which should be handled

warning: unused `Result` that must be used

--> src\main.rs:178:33

178 | ... w.write(event);

| ^^^^^^^^^^^^^^^

= note: this `Result` may be an `Err` variant, which should be handled

warning: unused `Result` that must be used

--> src\main.rs:180:29

180 | / ... write_element_block("cbvmda:itemExpirationDate", None, None, w, |w| {

181 | | ... let mut event: XmlEvent = XmlEvent::Characters("2022-03-12").into();

182 | | ... w.write(event);

183 | | ... });

| |_________________________^

= note: this `Result` may be an `Err` variant, which should be handled

warning: unused `Result` that must be used

--> src\main.rs:182:33

182 | ... w.write(event);

| ^^^^^^^^^^^^^^^

= note: this `Result` may be an `Err` variant, which should be handled

warning: unused `Result` that must be used

--> src\main.rs:197:5

197 | handle_event(&mut writer);

| ^^^^^^^^^^^^^^^^^^^^^^^^^^

= note: this `Result` may be an `Err` variant, which should be handled

warning: 71 warnings emitted

Finished dev [unoptimized + debuginfo] target(s) in 0.24s

Running `target\debug\RustGenerateEPCIS1_2XML.exe`

Process finished with exit code 0

Rust Requirements To Write Out EPCIS 1.2 XML

Target EPCIS 1.2 XML Output

Writing out XML using Closure

Update Rust Cargo.toml With Dependencies

Create Rust Codes To Write Out EPCIS 1.2 XML File

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