XML Schema selector Element
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Definition and Usage
The selector element specifies an XPath expression that selects a set of elements for an identity constraint (unique, key, and keyref elements).
Element Information
- Parent elements: key, keyref, unique
Syntax
<selector
id=ID
xpath=a subset of XPath expression
any attributes
>
(annotation?)
</selector>
(The ? sign declares that the element can occur zero or one time inside the selector element)
| Attribute | Description |
|---|---|
| id | Optional. Specifies a unique ID for the element |
| xpath | Required. Specifies an XPath expression, relative to the element being declared, that identifies the child elements to which the identity constraint applies |
| any attributes | Optional. Specifies any other attributes with non-schema namespace |
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