| Purpose |
Defines an identity constraint of type xs:keyref. This provides for constraints that are similar to referential integrity. The scope of the constraint is a single XML document. Each tuple value of an xs:refkey identity constraint must
match the corresponding value of the identity constraint of type
xs:key or xs:unique that is referenced by the
For details of the construction of the tuples representing the values of an identity constraint, please see section 3.11.4 Identity-constraint Definition Validation Rules of the W3C documentation XML Schema Part 1: Structures. |
| Parent element | xs:element |
| Child elements | xs:annotation,
xs:field,
xs:selector |
| Attributes | id,
name,
refer |
| Name | Type | Description |
|---|---|---|
id |
xs:ID |
Assigns an identifier to the schema node. |
name |
xs:NCName |
The names of all identity constraints (xs:key, xs:keyref and xs:unique) must be unique within a schema document. |
refer |
xs:QName |
The QName of a referenced identity constraint of type xs:key or xs:unique. |