Developing DTDs

Messages that pass between systems will typically conform to a previously agreed XML document type definition (DTD) that formally describes, in terms interpretable by both humans and computers, an internationally accepted message type.

XML DTDs can be developed by:

international standards bodies wishing to develop standardized sets of interchangeable data
industry associations wishing to develop agreed procedures for interchanging messages between members
one of the members of a multilateral or bilateral agreement to share information
a company wishing to supply information to a number of suppliers or customers
a company wishing to obtain information in a known format from a number of suppliers or customers.

Declarations that form a standardized XML DTD will typically be stored in separate files, which can be referenced, as an XML external subset, by those wishing to use it through the Internet Uniform Resource Locator that its originator has assigned to a publicly available copy of the data. Alternatively, if public access is to be restricted, the document type definition can be stored as the internal subset within the document type definition sent with the message.

Where the document type definition is based on classes of information shared by more than one message, each class of information can be defined in a separate file, known in XML as an external entity, these files being referenced in a suitable sequence from within the external or internal subset of the XML DTD.

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Developing DTDs

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