Adding Equation Support to a DITA XML Schema
To support equations in a DITA XML schema, you must integrate the atieqn-d domain into your schema. The following file supports this domain:
Arbortext-path\entities\atieqnDomain.xsd
You integrate the domain into your schema in the process defined in the XSD document-type shell: Coding requirements topic in the OASIS Darwin Information Typing Architecture (DITA) Version 1.2 standard. Follow these steps to integrate the domain into your schema:
1. Include the domain into your schema towards the top of the file, with the other domain inclusions:
<!-- ================ TOPIC DOMAINS ===================== -->
<xs:include schemaLocation="atieqnDomain.xsd"/>
2. In the MODULE INCLUDE DEFINITION section where commonElementGrp.xsd is imported, add a redefine entry integrating the domain extensions to the foreign element:
<xs:redefine schemaLocation="urn:oasis:names:tc:dita:xsd:commonElementGrp.xsd:1.2">
<xs:group name="foreign">
<xs:choice>
<xs:group ref="foreign"/>
<xs:group ref="atieqn-d-foreign"/>
</xs:choice>
</xs:group>
<!-- ... other domain integrations ... -->
3. In the INFO TYPES section, add the domain token to the domains attribute:
<xs:attributeGroup name="domains-att">
<xs:attribute name="domains" type="xs:string"
default="(topic hazard-d)
(topic hi-d)
(topic indexing-d)
(topic sw-d)
(topic pr-d)
(topic ui-d)
(topic ut-d)
(topic concept)
(topic concept glossentry)
(topic concept glossgroup)
(topic reference)
(topic task)
(topic task strictTaskbody-c)
(topic atieqn-d)
"/>
</xs:attributeGroup>