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.