code: private void appendSelectionCriteria(TableAlias alias, PathInfo pathInfo, SelectionCriteria c, StringBuffer buf)
      {
          appendColName(alias, pathInfo, c.isTranslateAttribute(), buf);
          buf.append(c.getClause());
          appendParameter(c.getValue(), buf);
      }
docs: Answer the SQL-Clause for a SelectionCriteria
  
  @param c
  @param buf