STAS ATTRIBUTE TYPES
                                       
   
     _________________________________________________________________
   
   STAS supports several types of attributes, in addition to the normal
   _BIB-1_ attributes:
     * STAS USE Attributes
     * STAS RELATIONSHIP Attributes
     * STAS SEARCH TYPE Attributes
     * STAS SEARCH SCOPE Attributes
     * STAS SEARCH CROSSOVER Attributes
     * STAS COMPLETENESS Attributes