You can use this function to have the model add user-defined data to the XML meta data file that also contains model run information.
A call to this function
TEXT ignore := add_user_xml ( k; v )
adds the key k and value v to the XML meta data file, if that file is generated. It inserts an element looking like:
<itp:element>
<itp:key>k</itp:key>
<itp:value>v</itp:value>
</itp:element>
The return value of the function should be ignored. The parameters are both of type CONST TEXT.