IDREF Attribute Type
The IDREF Attribute Type is defined by the W3C XML 1.0 Recommendation.
Reference: *W3C - XML 1.0 - Attribute Types
- Specific Attributes with Type IDREF
- Common Attributes with Type IDREF
- Attribute Value for Type IDREF
Specific Attributes with Type IDREF
for:
This is declared on the element:labelusemap:
This is declared on the elements:object,img,input type="image"
Common Attributes with Type IDREF
There are no Common Attributes with type IDREF.
Attribute Value for Type IDREF
A reference to an element identifier of type ID
The IDREF Attribute Type allows an element with such an attribute to refer to
another element by its id.
For example, a label element may have a
for
attribute (of type IDREF) which refers to the id of
the input
(or select,
textarea etc.) element for which it is a label.
The code below shows how a label may be
assigned to an input type="text" element:
The value of an attribute with Type IDREF must correspond to the value of
an existing id attribute in the document. If it does not
W3C Validation will result in a warning. (Interestingly, it is only
a warning which is generated and not an error - despite the
*XML 1.0 Validity Constraint for IDREF.)
Page Footer & Copyright
Copyright © Sally Maughan 2005-2009 (Page last updated on 01 Oct 2009)
*
- hosted by *Openstrike
Content based on the W3C Working Draft: *XHTML 1.1 and Recommendation: *XHTML Modularisation 1.1.
W3C, XHTML, XML, HTML, CSS and MathML are *Trademarks of the W3C (*MIT, *ERCIM, *Keio) with which the site's author has no connection.