XML Schema unique Element
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Definition and Usage
The unique element defines that an element or an attribute value must be unique within the scope.
The unique element MUST contain the following (in order):
- one and only one selector element (contains an XPath expression that specifies the set of elements across which the values specified by field must be unique)
- one or more field elements (contains an XPath expression that specifies the values that must be unique for the set of elements specified by the selector element)
Element Information
- Parent elements: element
Syntax
<unique
id=ID
name=NCName
any attributes
>
(annotation?,(selector,field+))
</unique>
(The ? sign declares that the element can occur zero or one time inside the unique element)
| Attribute | Description |
|---|---|
| id | Optional. Specifies a unique ID for the element |
| name | Required. Specifies a name for the element |
| any attributes | Optional. Specifies any other attributes with non-schema namespace |
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