September 2002
Intermediate to advanced
1008 pages
22h 3m
English
book
XML Schema Complete Reference, The
by Cliff Binstock, Chris Galtenberg, Mike Wooding, Chris Dix, Mitchell Smith, Dave Peterson
Content preview from XML Schema Complete Reference, The
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Chapter 13. Identity Constraints
IN THIS CHAPTER
13.1 Identity Constraint Example
13.2 Concepts and Observations
13.3 The unique Element
13.4 The key Element
13.5 The keyref Element
13.6 The selector Element
13.7 The field Element
Chapter 1 defines an XML validator as an XML parser layer that validates an XML instance against an XML schema. An XML validator is effectively the front end of a compiler. Specifically, a “vanilla” XML parser understands XML lexical tokens and parses against a simple XML grammar. Most of the features of a DTD place further constraints on the grammar. The newer XML Schema provides an even more complete grammar definition.
When a compiler has finished parsing, the next step is typically semantic validation. Semantic ...
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