DTD Attribute Types - IDREFS

• Type: IDREF
• Type: NMToken

The attribute type of IDREFS is used for referring to the ID values of more than one other element in the document. Each value is separated by a space.

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:

• Type: IDREF
• Type: NMToken