DTD Attribute Types - IDREF
The attribute type of IDREF
is used for referring to an ID
value of another element in the document.
Syntax:
Example:
Valid XML - The following XML document would be valid, as it conforms to the above DTD:
Invalid XML - The following XML document would be invalid. This is because the manager_id
attribute of the second element contains a value that isn't the same as a value of another element that contains an attribute with a type of ID
: