occurrence_class

   One of the attributes of an occurrence that tells you what kind of
   occurrence it is. The occurrence class indicates if an occurrence
   is a declaration, a reference, or another class. It also indicates
   what kind of declaration or reference it is. You can instruct SCA
   to show you only occurrences with a particular occurrence class
   using the OCCURRENCE= attribute selection. For example, you can
   ask for write references using OCCURRENCE=WRITE.