A significant subset of the architecture can be described using XML extended links. Independent links Link constructs are independent of each of their anchors. Topics are specialized link elements. They express a certain kind of relationship, and link element instances can be grouped by type. Other filtering attributes will be added in a future version of the architecture, such as language, validity, etc.
Topics can have zero or several titles.
Topics can be used for the representation of indexes, glossaries, and cross-references. They play the same role as index term. The nature of the role played by the relation is left to the application architect. It is possible to describe all kinds of relations existing in a thesaurus without limits on the semantics of each of the relationship.