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Subject: Extending subject schemes
Robert and I are trying to work the items that are in draft comments
in the 1.3 spec. We need help from the TC on the following draft
comment (enclosed in a table below) in the "Extending subject
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 subject-scheme map; the
result is equivalent to specifying all of the values in a single subject scheme map.
For the two referenced example topics, see the following:
Example: Extending a subject scheme
Example: Extending a subject scheme upwards
We either need to add normative content, or consider removing the example topics (which were present in 1.2). I don't know whether anyone is using this aspect of subjectScheme ...
Kristen James Eberlein
Chair, OASIS DITA Technical Committee
Principal consultant, Eberlein Consulting
+1 919 682-2290; kriseberlein (skype)