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Subject: subjectScheme and extension


Here is the normative content from the DITA 1.2 spec (Language Reference):

3.1.5.1.2 schemeref

A <schemeref> element provides a reference to another scheme. Typically, the referenced scheme defines a base set of controlled values extended by the current scheme. The values in the referenced scheme are merged with the current scheme; the result is equivalent to specifying all of the values in a single map.

All the specific content about extending the subjectScheme (whether upwards or downwards) then is laid out in the examples.

Here is the normative ontent from the draft DITA 1.3 spec (Architectural Specification and Language Reference):

2.2.3.5 Extending subject schemes
The <schemeref> element provides a mechanism for extending a subject scheme. This makes it possible to add new relationships to existing subjects and extend enumerations of controlled values.

The <schemeref> element provides a reference to another subject scheme map. Typically, the referenced subject-scheme map defines a base set of controlled values that are extended by the current subject-scheme map. The values in the referenced subject-scheme map are merged with the values in the current subjectscheme map; the result is equivalent to specifying all of the values in a single subject scheme map.

3.6.1.2 <schemeref>
A <schemeref> element references another subject scheme map. Typically, the referenced subject scheme defines a base set of controlled values; the referencing map then extends the base set of controlled values. The values specified in the subject scheme maps are merged; the result is equivalent to specifying all of the values in a single map.

My inclination is to leave this as-is.

--
Best,
Kris

Kristen James Eberlein
Chair, OASIS DITA Technical Committee
Principal consultant, Eberlein Consulting
www.eberleinconsulting.com
+1 919 682-2290; kriseberlein (skype)



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