Cover Pages: Darwin Information Typing
Cover Pages: Darwin Information Typing Architecture (DITA XML): kindof a mix between topicmaps and the holy grail of technical writing: content reuse, "DITA is an architecture for creating topic-oriented, information-typed content that can be reused and single-sourced in a variety of ways." The FAQ is useful:
"Q: What is a topic?
A: A topic is a chunk of information organized around a single subject. Structurally, it is a title followed by text and images, optionally organized into sections. Topics can be of many different types, the most common being concepts, tasks, and reference."
Note this is different from the definition of a topic in Topicmaps. This format is for technical writing and content reuse, not for ontology modeling and merging.