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Arguments

command_context
   type:       $SCA_COMMAND_CONTEXT
   access:     read/write
   mechanism:  by reference

   An SCA command context.

query_context
   type:       $SCA_QUERY_CONTEXT
   access:     write only
   mechanism:  by reference

   An SCA query context to be initialized. This value is passed as an
   argument to other SCA query routines (SCA$QUERY_xxx).