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Schema References
XSD Reference XSD ValidatorXML 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>
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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