Open Traceability (C#)

This is an open-source library for handling traceability data in .NET using C#.

Release Notes

Version 1.4

In version 1.4, the OpenTraceability C# project was updated to target .Net Standard 2.0. This update provides support for .NET Framework versions 4.6.1 and greater while maintaining support for .NET and .NET CORE 2.0+. This allows .NET framework projects to consume the OpenTraceability nuget package while preserving support for later versions of .NET Core and .NET.

• Added support for .Net Standard 2.0

Setup

Before you can use the library you need to make sure to call the Setup method.

If you are just using the core library, you should call:

OpenTraceability.Setup.Initialize();

However, if you are using an extension library such as:

• OpenTraceability.GDST

Then you just need to call the setup method for that library such as:

• OpenTraceability.GDST.Setup.Initialize();

And that will initialize everything you need.

Models

We have C# models that represent the various data objects in EPCIS including events, documents, and master data. Feel free to explore them.

This library was designed so that it could easily be extended to support many new CTEs/KDEs. It was also designed so that even without an extension library, the core library can still receive CTEs/KDEs from unknown extensions and namespaces and serialize/deserialize the data without losing any information.

More information on extensions can be found in the documentation later on. (coming soon)

EPCIS Query Document / EPCIS Document

These two objects inherit from the same base class EPCISBaseDocument and represent the two types of documents in EPCIS. They are used to represent the XML and JSON-LD versions of the documents. The Events and Master Data are stored in the EPCISBaseDocument.Events and EPCISBaseDocument.MasterData properties respectively.

It's important to note that the EPCISBaseDocument.EPCISVersion property is used to determine the version of the document. This is important because when mapping from the models into the XML or JSON-LD formats, the version is used to determine which format to use. If you are trying to map into EPCIS XML 2.0 and not EPCIS XML 1.2, then you need to make sure that the EPCISBaseDocument.Version property is set to EPCISVersion.V2.

EPCIS Document Header

The XML format for EPCIS 1.2 and 2.0 require a Standard Business Document Header (SBDH). This is represented by the StandardBusinessDocumentHeader class. When converting from EPCIS JSON-LD into XML, you need to make sure to set this if the check schema is enabled. Otherwise, you will fail the schema validation.

You can use StandardBusinessDocumentHeader.DummyHeader to get a dummy header that you can use to pass schema validation for the XML formats.

Mapping

We support mapping between EPCIS 1.2 XML, EPCIS 2.0 XML, and EPCIS 2.0 JSON-LD. Our mappers are thread-safe and are accessible from the OpenTraceability.Mappers.OpenTraceabilityMappers static object.

Reading EPCIS 1.2 XML

In order to read an EPCIS Query Document from an XML string in the EPCIS 1.2 xml format you can do the following:

// You can read an XML string representing an EPCIS 1.2 Query Document in XML format. EPCISQueryDocument doc = OpenTraceabilityMappers.EPCISQueryDocument.XML.Map(queryDocXmlStr);

In order to read an EPCIS Document from an XML string in the EPCIS 1.2 xml format you can do the following:

// You can read an XML string representing an EPCIS 1.2 Document in XML format. EPCISDocument doc = OpenTraceabilityMappers.EPCISDocument.XML.Map(docXmlStr);

Reading EPCIS 2.0 XML

This is done the same way as the 1.2 XML above. It auto-detects the version and maps it to the correct object.

In order to read an EPCIS Query Document from an XML string in the EPCIS 2.0 xml format you can do the following:

// You can read an XML string representing an EPCIS 2.0 Query Document in XML format. EPCISQueryDocument doc = OpenTraceabilityMappers.EPCISQueryDocument.XML.Map(queryDocXmlStr);

In order to read an EPCIS Document from an XML string in the EPCIS 2.0 xml format you can do the following:

// You can read an XML string representing an EPCIS 2.0 Document in XML format. EPCISDocument doc = OpenTraceabilityMappers.EPCISDocument.XML.Map(docXmlStr);

Reading EPCIS 2.0 JSON-LD

In order to read an EPCIS Query Document from a JSON string in the EPCIS 2.0 JSON-LD format you can do the following:

// You can read an XML string representing an EPCIS 2.0 Query Document in JSON-LD format. EPCISQueryDocument doc = OpenTraceabilityMappers.EPCISQueryDocument.JSON.Map(queryDocXmlStr);

In order to read an EPCIS Document from a JSON string in the EPCIS 2.0 JSON-LD format you can do the following:

// You can read an XML string representing an EPCIS 2.0 Document in JSON-LD format. EPCISDocument doc = OpenTraceabilityMappers.EPCISDocument.JSON.Map(docXmlStr);

Convert EPCIS 1.2 XML to EPCIS 2.0 XML

This example is for reading an EPCIS Query Document, but it would work the same with EPCIS Document as well.

// read the EPCIS 1.2 XML string EPCISQueryDocument doc = OpenTraceabilityMappers.EPCISQueryDocument.XML.Map(queryDocXmlStr_1_2); // set the EPCIS version doc.EPCISVersion = EPCISVersion.V2; // write it back out now string queryDocXmlStr_2_0 = OpenTraceabilityMappers.EPCISQueryDocument.XML.Map(doc);

Convert EPCIS 1.2 XML to EPCIS 2.0 JSON-LD

This example is for reading an EPCIS Query Document, but it would work the same with EPCIS Document as well.

// read the EPCIS 1.2 XML string EPCISQueryDocument doc = OpenTraceabilityMappers.EPCISQueryDocument.XML.Map(queryDocXmlStr_1_2); // set the EPCIS version doc.EPCISVersion = EPCISVersion.V2; // write it back out now string queryDocJsonStr_2_0 = OpenTraceabilityMappers.EPCISQueryDocument.JSON.Map(doc);

Querying for Data

We support querying traceability and master data using a very specific flavor of communication protocols from GS1.

• We support querying for event data using the GET - /events endpoint on the EPCIS 2.0 Query Interface.
• We support resolving master data from a GS1 Digital Link Resolver using the GS1 Web Vocab JSON-LD format.

EPCIS Query Interface

The first interface that can be queried is for events from an EPCIS 2.0 Query Interface at the GET - /events endpoint. This is done using the EPCISTraceabilityResolver class.

In order to use this, you need:

• EPCISQueryInterfaceOptions

  • URL
  • Version
  • Format

• EPCISQueryParameters

  • Here you can define one or more parameters for filtering the desired results.

using HttpClient = new HttpClient(); EPCISQueryInterfaceOptions options = new EPCISQueryInterfaceOptions() { URL = new Uri(url), Format = _format, Version = _version, EnableStackTrace = true }; EPC epc = new EPC("urn:epc:id:sgtin:0614141.107346.2019"); EPCISQueryParameters parameters = new EPCISQueryParameters(epc); return await EPCISTraceabilityResolver.QueryEvents(options, parameters, client);

You can also use the trace-back feature to automatically trace-back the EPC.

using HttpClient = new HttpClient(); EPCISQueryInterfaceOptions options = new EPCISQueryInterfaceOptions() { URL = new Uri(url), Format = _format, Version = _version, EnableStackTrace = true }; EPC epc = new EPC("urn:epc:id:sgtin:0614141.107346.2019"); return await EPCISTraceabilityResolver.Traceback(options, epc, client);

GS1 Digital Link Resolver

You can also resolve master data from a GS1 Digital Link resolver with the MasterDataResolver class. This class takes in a DigitalLinkQueryOptions object that contains the URL of the resolver and also an EPCISBaseDocument and will search the EPCISBaseDocument for any master data that is not in the document but referenced in the events, and try and resolve it and add it to the document.

DigitalLinkQueryOptions options = new DigitalLinkQueryOptions() { URL = new Uri(url), EnableStackTrace = true }; await MasterDataResolver.ResolveMasterData(options, doc, client);

Finally

You can always look in our unit tests for more examples of how to use the library.