CEN/TC 440/WG 1 - Architecture

This document describes:
-   the rationale for building customisation supporting business cases that are specific to their business environment while maintaining organisational and semantic interoperability with the TC 440 specifications;
-   the difference between Usage specification and Extension specification;
-   a methodology on how to define customisations on:
-   BII Transaction specification,
-   Business rules,
-   Code lists;
-   how to claim compliance or conformance to a customisation of a TC 440 specification;
-   the connection to the eProcurement Ontology project.
This specification does not describe the detailed process of building an extension.