9.3 Property Set Definition
Property set definitions are described fully in the Property Set Definition Requirements of ISO/IEC 10744.  This clause presents a simplified version that includes only those details necessary for the understanding of this International Standard.
The top-level element is a propset element.  The psn and fullnm attributes specify a short SGML name and a long descriptive name.  At various places within the property set, the following elements are allowed:

•  desc contains a description of the object that is being defined by the element in which it occurs.

•  note contains notes about the object being defined.