YouTipXML Schema selector Element | Tutorial
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XML Schema selector Element
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 ? symbol declares that the element can occur zero or one time in the restriction element.)
| Attribute | Description |
|---|---|
| id | Optional. Specifies a unique ID for the element. |
| xpath | Required. Specifies an XPath expression relative to the declared element. This expression identifies the child elements to which the identity constraint (the declared element) applies. |
| any attributes | Optional. Specifies any other attributes with a non-schema namespace. |