adds column cross-reference for service descriptor

import uk.ac.starlink.table.*;// ColumnInfo needed

import uk.ac.starlink.votable.*;

class ObscoreExt

{

   static private ColumnInfo genPubDidColInfo()

   {

      ColumnInfo colInfo = new ColumnInfo( "obs_publisher_did", String.class,  "Publisher Did" );

      colInfo.setAuxDatum(new DescribedValue(VOStarTable.ID_INFO, "primaryID"));

      return colInfo;

   }

   public static final ColumnInfo[] OBSCORE_COLINFO =

   {

      new ColumnInfo( "dataproduct_type",  String.class,  "Dataproduct Type (image|cube)" ),

      new ColumnInfo( "calib_level",       Integer.class, "Calibration level" ),

      new ColumnInfo( "obs_collection",    String.class,  "Collection" ),

      new ColumnInfo( "obs_title",         String.class,  "Title" ),

      new ColumnInfo( "obs_id",            String.class,  "Observation Id" ),

      new ColumnInfo( "obs_publisher_did", String.class,  "Publisher Did" ),

      genPubDidColInfo(),

      new ColumnInfo( "bib_reference",     String.class,  "Bibbliographic refererence" ),

      new ColumnInfo( "data_rights",       String.class,  "Data rights" ),