A Subject Scheme Map is actually a DITA Map specialization.
Oxygen recognizes a DITA specialization on the fly so there is no need for you to create a document type definition for it.
Oxygen has new file templates for easily creating Subject Scheme Maps so if you use the New
toolbar button and search for subject scheme
you will be able to use the template to create and start editing a Subject Scheme map. The map should be edited in the main editor in the Text page. But from your post, I think you already know this.
Then, as the documentation you found states, the Subject Scheme Map needs to be referenced from your main DITA Map like:
- Code: Select all
<topicref href="path/to/subjectScheme.ditamap" format="ditamap" type="subjectScheme"/>
This should be enough to show the values you have defined in the Subject Scheme map as proposals in the Attributes view when editing attributes for DITA elements.