XML Model Glossary

union

Derivation of a simple type to restrict its values to a collection of built-in and

 

simple data types

unique

An identity constraint used to specify that an element or attribute value (or set

 

of values) must be unique or null within a specified scope

URI

Uniform Resource Identifier. A string of characters which identifies an

 

Internet resource

XDR

XML-Data Reduced. An XML language defining the structure of an XML

 

file. It is a simplified XSD (or schema)

XML

Extensible Markup Language. Used for structuring documents with self-

 

describing tags in plain text format

XML language

Language used to define the structure of an XML model. It can be Document

 

Type Definition 1.0 or XML Schema Definition 1.0

XPath

XML Path Language. A language to address parts of an XML document

 

 For more information on XPath, see XPath abbreviated syntax in

 

section Defining an identity constraint selector, in chapter Building an XML

 

model

XSD

XML Schema Definition (or schema). An XML language defining the

 

structure of an XML file. It supports namespaces and datatypes

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PowerDesigner

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Sybase manual Union, Unique, XML language, XPath, 270