A set of NPCL types and constraints can be represented in a topic
map as a collection of topics, occurrences and associations. This feature
enables a topic map to carry its own type and constraint information
without the need to use any external files. It also enables the use of
generic topic map editing and processing tools to create and update the
type and constraint information for a topic map. This section describes
how an NPCL schema can be represented in a topic map.
Note
Although we describe the NPCL representation in XML Topic Maps
(XTM) syntax in this document, it is important to realize that most
often you will be creating your schemas using either the NPCL XML Schema
or using tools such as the Topic Map Editor - you will only very rarely need to
create the XTM structures shown here yourself.
