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"/>
|
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