Metadata elements include information that is located within
the <topicmeta> element (in maps) or <prolog> element (in topics),
as well as indexing elements that can be placed in additional locations
within topic content.
The delayed conref resolution domain provides several elements for use when using
situations that enable delayed or delivery time resolution of conref. The elements
allow users to
resolve some conref values statically, while delaying others for later resolution.