The document discusses Web 2.0 and how it relates to Topic Maps. It defines Web 2.0 as the participatory web where anyone can publish and interact. Common Web 2.0 features include wikis, tags, comments, and folksonomies. Topic Maps is about structured knowledge representation and can represent these Web 2.0 features. While Web 2.0 emphasizes minimal structure, Topic Maps provides a standardized structure for relating information. Some examples are given of how Topic Map applications could take advantage of Web 2.0 approaches and participation.