United Nations Rules for Electronic Data Interchange for Administration, Commerce and Transport (UN/EDIFACT)
This GitHub repository holds DFDL schemas that model UN/EDIFACT interchanges.
To download the repository go to http://dfdlschemas.github.com/EDIFACT/.
UN/EDIFACT data streams have a hierarchical structure where the top level is referred to as an interchange, and lower levels contain multiple messages which consist of segments, which in turn consist of composites and elements. Composites in turn consist of elements. Segments, composites and elements are delimited by separators. Only segments have initiators. An interchange starts with a UNB segment and ends with a UNZ segment. A message starts with a UNH segment and ends with a UNT segment, an element in the UNH segment identifying the message type. Messages may be grouped into functional groups, which start with a UNG segment and end with a UNE segment. Optionally the interchange can start with a UNA segment which defines the delimiters used by the interchange; defaults are used if there is no UNA. UN/EDIFACT data streams adopt one of several syntax levels, the most common being version 3 or version 4.
The following are included in this repository:
Folder 'EDIFACT-SupplyChain-D03B' contains a pair of DFDL schemas that model a UN/EDIFACT Supply Chain interchange for release D.03B. Message types DESADV, INVOIC, ORDCHG, ORDERS, ORDRSP, RECADV and REMADV. Test data and infosets are included.
Folder 'EDIFACT-Common' contains a DFDL schema to define default values for DFDL properties, and a DFDL schema to model the Uxx service segments and service messages for syntax version 4. Service message types AUTACK, CONTRL and KEYMAN.
To support UN/EDIFACT syntax version 3 instead of syntax version 4, edit IBM_EDI_FORMAT.xsd in the 'EDIFACT-Common' folder and change DFDL variable 'RepeatSep' to have default value '+' instead of '*'.
To support ',' as the default decimal separator instead of '.', edit IBM_EDI_FORMAT.xsd in the 'EDIFACT-Common' folder and change DFDL variable 'DecimalSep' to have default value ',' instead of '.'.
The supplied DFDL schemas will parse UN/EDIFACT interchanges with or without new lines at the end of each segment, but will serialize interchanges without new lines. To serialize with new lines, edit EDIFACT-Service-Segments-4.1.xsd in the 'EDIFACT-Common' folder and change the DFDL expression used to set DFDL variable 'SegmentTerm' to the commented-out value.
The DFDL schemas are structured so that if an error is encountered while parsing an interchange, the parser will create a BadMessage element in the DFDL infoset, and skip to the next message. It is therefore important that the infoset is checked after a successful parse, to see if any BadMessage elements exist.
The DFDL schemas are compatible with IBM DFDL 1.0 and 1.1 releases, as shipped in IBM WebSphere Message Broker 18.104.22.168 onwards and IBM Integration Bus 22.214.171.124 onwards, respectively.
IBM WebSphere Message Broker and IBM Integration Bus
It is recommended that each folder becomes a library project with the same name as the folder. This is because the schemas in the 'EDIFACT-<Industry>-<Release>' folder reference the schemas in the 'EDIFACT-Common' folder using a relative schemaLocation path (example below), and so that the 'EDIFACT-Common' schemas can be shared by multiple libraries.
<xsd:import namespace="http://www.ibm.com/dfdl/EDI/Format" schemaLocation="../EDIFACT-Common/IBM_EDI_Format.xsd"/>
The EDIFACT libraries may then be referenced by integration flows in Applications.
When deploying the EDIFACT libraries to a broker, it is recommended to increase the Java heap size of the target execution group to at least 1GB, using the following command:
mqsichangeproperties <broker> -e <execgrp> -o ComIbmJVMManager -n jvmMaxHeapSize -v 1073741820
The United Nations Rules for Electronic Data Interchange for Administration, Commerce and Transport (UN/EDIFACT) can be obtained from the United Nations Economic Commission for Europe (UNECE) website: http://www.unece.org/tradewelcome/areas-of-work/un-centre-for-trade-facilitation-and-e-business-uncefact/outputs/standards/unedifact/directories/download.html
For any further reproduction of UN/CEFACT material please contact email@example.com.
Please observe the copyright notice within each schema.
DFDL schemas for other UN/EDIFACT releases and message types are available from IBM, please contact firstname.lastname@example.org.