docs: public ForeignkeyDef getForeignkey(String name, String tableName)
      {
          String        realName = (name == null ? "" : name);
          ForeignkeyDef def      = null;
  
          for (Iterator it = getForeignkeys(); it.hasNext();)
          {
              def = (ForeignkeyDef)it.next();
              if (realName.equals(def.getName()) &&
                  def.getTableName().equals(tableName))
              {
                  return def;
              }
          }
          return null;
      }