Exchanging Topic Maps and information

Topic Maps are based on an abstract data model

Topic Maps can be saved and exchanged in many different ways

XML Topic Maps define an exchange format for topic maps

A XML Topic Map document is expressed in the syntax defined by the XML Topic Maps specification (http://www.topicmaps.org/xtm/1.0)

The Topic Map standard also includes Public Subject Identifiers (PSI) that can be used to refer to common subjects across Topic Maps.