The features and capabilities of content referencing was extended in
DITA 1.2, making it possible to conref multiple elements at the one time, to
indirectly reference content, and to
push content from the source element.
Indirect content referencing
The keyref feature was introduced in DITA 1.2 to allow indirect referencing in links, images, and content references. Rather than referencing an element directly in the conref attribute, you can reference a key, the destination of which you specify in the ditamap.
The conref push technique
The conref push technique allows content from a source topic to be inserted into another topic, without any special code in the topic where the content will be re-used.