XML Schema field Element

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# 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)

Attribute | Description
--- | ---
id | Optional. Specifies a unique ID for the element
xpath | Required. Identifies a single element or attribute whose content or value is used for the constraint
any attributes | Optional. Specifies any other attributes with non-schema namespace

### 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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