A dictionary

A dictionary is a container for entry elements. Dictionaries can also contain unit-related information.

The dictRef attribute on a dictionary element sets a namespace-like prefix allowing the dictionary to be referenced from within the document. In general dictionaries are referenced from an element using the dictRef attribute.

&dictionary1.html;

dictionary can be used in an instance document to reference the dictionary used. Example:

&dictionary2.html;

This is so that a reference to a UnitList can be put in a dictionary.
URI giving the location of the document. Mandatory if dictRef present.