/ modules / paradigms / Identification_String.py 

 SYNOPSIS

     Identification_String (table, idColumn, matchColumn, namespaces,
         cardinality)

         table
             A table to query, e.g., "holding".

         idColumn
             The table's internal identifier column (i.e., the column
             to be selected), e.g., "holding_id".

         matchColumn
             The table's external identifier column (i.e., the column
             against which the constraint is to be placed), e.g.,
             "fips_state_code".

         namespaces
             A list of zero or more namespaces that the external
             identifiers are members of, e.g., ["FIPS 5-2 alpha"].

         cardinality
             A Cardinality object representing the cardinality of
             'table' with respect to 'matchColumn'.

 DESCRIPTION

     Translates an identification constraint to an SQL string
     equality test, e.g.,

         SELECT idColumn FROM table
             WHERE matchColumn = 'id'

     where 'id' is the identifier mentioned in the constraint.  If
     the namespace mentioned in the constraint is not one of the
     supported namespaces, the query

         SELECT idColumn FROM table
             WHERE 1 = 0

     is returned.

     Exceptions thrown:

         none

 AUTHOR

     Greg Janee
     gjanee@alexandria.ucsb.edu

 HISTORY

     $Log: Identification_String.py,v $
     Revision 1.1  2003/04/16 18:32:10  valentin
     updated to latest translator code

     Revision 1.1  2003/02/05 06:17:48  gjanee
     Initial revision