anchor.diff:  'KNOWN','NOVEL','PUTATIVE','PREDICTED','KNOWN_BY_PROJECTION','UNKNOWN'")
      (description :type string)
      (is-current :type integer)
  +   (analysis             :db-kind :join
  +			 :db-info (:join-class analysis
  +                                   :foreign-key analysis-id
  +				   :home-key analysis-id
  +				   :retrieval :deferred))
      (gene :db-kind :join
            :db-info (:join-class gene
                                  :home-key gene-id
  
positive.code:    (rank :type integer :db-constraints :not-null)
     (attrib :type string #||set('default_version','sequence_level')||#)))
  
  
  ;;; Sequence tables
  ;;; ---------------
  
negative.code:    (status :type string)
     (description :type string)
     (is-current :type integer)
     (analysis   :db-kind :join
  	       :db-info (:join-class analysis
  			 :home-key analysis-id
  			 :foreign-key analysis-id
  			 :retrieval :deferred))
     (transcript :db-kind :join
                 :db-info (:join-class transcript
                           :home-key gene-id
  