Whenever copies of a segment appear in multiple places or pages, one of these occurrences would be declared as the master or template. This template would be extended by the other copies of this template. It is the template version which must receive subsequent modification that is applicable to all. Whereas any change could be made to the other occurrences individually, for mock presentation.

Segments could be re-used within a page; when re-using segments in other pages, the "base-page-id" must be provided, to signify the source of such segment.