Specifies whether the topic or map referenced should be processed normally or treated as
a resource that is only included in order to resolve key or content references.
- processing-role="normal"
- The topic is a readable part of the information set. It is included in navigation and
search results. This is the default value for the <topicref> element.
- processing-role="resource-only"
- The topic should be used only as a resource for processing. It is not included in
navigation or search results, nor is it rendered as a topic. This is the default value
for the <keydef> element.
If the @processing-role attribute is not specified locally, the value cascades from the
closest element in the containment hierarchy.