DTD Attribute Types - ENTITIES
The attribute type of ENTITIES
allows you to refer to multiple entity names, 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 in the first element, a comma is being used to separate the two values of the photo
attribute (a space should be separating the two values):