A parment is an inline entity for identifying a parameter entity. A parameter entity is generally found in DTDs. It is distinguishable from a text entity by its use of the percent symbol rather than the ampersand.
This is a specialization of keyword. <parment>my-parameter-entity</parment>
+ topic/keyword xml-d/parment
Don't forget your trailing semi-colon from your <parment>my-parameter-entity</parment> in your DTD.
Figure 20. Sample of an instance of the parment element