13.2. Concepts and Observations
This section covers terminology unique to identity constraints. Furthermore, this section expounds upon two of the new terms: selector and field. Every identity constraint specifies a selector and one or more fields.
13.2.1. Identity Constraint Terminology
Identity constraints are a very small part of the Schema Recommendation. There is some terminology specific to identity constraints. The following list provides the terminology that is the foundation of the text in this chapter:
Node: The PSVI describes a tree that represents an XML instance. The tree is made up of a set of nodes (See Chapter 2). Some of these nodes, particularly those associated with elements and attributes, provide the infrastructure for ...
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