XML Pocket Reference, 3rd Edition

Name

xs:field

Attributes

xpath

An XPath expression used by the xs:unique, xs:key, or xs:keyRef element containing the xs:field

Contents

xs:annotation?

xs:field is used within xs:unique, xs:key, or xs:keyRef elements and stores an XPath location path. These expressions use a very simplified subset of XPath, permitting only abbreviated syntax for the child (/), descendent-or-self (//), and attribute axes to be used. (In place of explicit element names, the * expression may be used to match any name, and the prefix:* expression to match any name in a given namespace.) Multiple location paths may be stored in the xpath attribute, each separated by a vertical bar.