XML Schema field Element

Complete XML Schema Reference

Definition and Usage

The field element specifies an XPath expression that specifies the value used to define an identity constraint.

Element Information

• Parent elements: key, keyref, unique

Syntax

<field
id=ID 
xpath=XPath expression
any attributes
>

(annotation?)

</field>

(The ? sign declares that the element can occur zero or one time inside the field element)

Example 1

The following example shows a field element that specifies the "userID" attribute as the field to use for the identity constraint:

<xs:field xpath="@userID"/>

Complete XML Schema Reference

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