Schlagwort-Normdaten
          
               
               
               
MARC21       553     Valid Number Tracing (R)
  Subfields: 
             $a   Classification number element--single number or beginning number of
                     span (R)
             $c   Classification number element--ending number of* span (R)
             $h   Caption hierarchy (R)
             $i   Reference instruction phrase
             $j   Caption
             $k   Summary number span caption hierarchy (R)
             $t   Topic
             $w   Control subfield
                  ** /0 Special relationship
                  ** a Previous classification number
                  ** b New classification number
                  ** i Reference instruction phrase in subfield$i
                  ** j See reference
                  ** k Class elsewhere reference
                  ** l See also reference 
                  ** m Standard subdivisions do-not-use reference
                  ** n Not applicable
                  ** /1 Hierarchical relationship
                  ** g Number representing broader topic
                  ** h Number representing narrower topic
                  ** n Not applicable
                  ** /2 Reference display 
                  ** a Reference not displayed
                  ** n Not applicable
                  ** /3 History reference
                  ** a History reference, field 685 used
                  ** n Not applicable
             $y   Table identification--schedule
             $z   Table identification--table number

 Indic/etc.: 1st: Source of classification number
             0 Schedule
             1 Table
             2nd: Undefined; contains a blank (#)