| Purpose | This element defines a component of the
identity constraint (xs:key, xs:keyref,
xs:unique).
|
| Parent element | xs:key, xs:keyref or
xs:unique |
| Child elements | xs:annotation |
| Attributes | id,
xpath |
| Name | Type | Description |
|---|---|---|
id |
xs:ID |
Assigns an identifier to the schema node. |
xpath |
A list of one or more XPath expressions that select the possible nodes that contribute to the values of the identity constraint. For details of the syntax, see section 3.11.6 Constraints on Identity-constraint Definition Schema Components of the W3C documentation XML Schema Part 1: Structures. For an example, see section 5.1 Specifying Uniqueness of the W3C documentation XML Schema Part 0: Primer. |