Schema Tutorial
XSD HOME XSD Intro XSD Why Use XSD How To XSD <schema>Simple Types
XSD Elements XSD Attributes XSD RestrictionsComplex Types
XSD Elements XSD Empty XSD Elements Only XSD Text Only XSD Mixed XSD Indicators XSD <any> XSD <anyAttribute> XSD Substitution XSD ExampleData Types
XSD String XSD Date XSD Numeric XSD MiscXSD Editor XSD Summary
Schema References
XSD Reference XSD ValidatorXML Schema unique Element
Complete XML Schema Reference
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>
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 |
Complete XML Schema Reference
Your suggestion:
Close [X]
Thank You For Helping Us!
Your message has been sent to W3Schools.
Close [X]
