pids	The pids tag enables you to define the set of pid supported.

id                  	Specifies an unique identifier for this element.
implementation      	Specifies the implementation class name.
idref               	Specifies a reference to the element with the matching <a href=&quot;"idAttribute.

<description>         	Specifies the pids description.
<history>             	Specifies the pids history.
<units>               	Specifies the pids units.
<deprecated>          	Specifies that the contents of this element should be marked as deprecated.
<specreference>       	Specification reference for pids.
<key>                 	Specifies the unique pids key.
<pid>                 	Specifies the pid.
