This topic collects the rules that concern DITA document-type shells.
While the DITA specification only defines coding requirements for DTD, RELAX NG, and XML Schema documents, conforming DITA documents MAY use other document-type constraint languages, such as Schematron.
With two exceptions, a document-type shell MUST NOT directly define element or attribute types; it only includes and configures vocabulary and constraint modules. The exceptions to this rule are the following:
@domainsattribute; these values reflect the details of the domains and structural types that are integrated by the document-type shell.
Document type shells that are not provided by OASIS MUST NOT indicate OASIS as the owner; the public identifier or URN for such document-type shells SHOULD reflect the owner or creator of the document-type shell.
For example, if example.com creates a copy of the document type shell for topic, an appropriate public identifier would be "-//example.com//DTD DITA Topic//EN", where "example.com" is the owner identifier component of the public identifier. An appropriate URN would be "urn:example.com:names:dita:rng:topic.rng".
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