public String getAbbrev() {
   Attribute att = ve.findAttributeIgnoreCase(CDM.ABBREV);
   return (att == null) ? null : att.getStringValue();
 }
 private String getCalendarAttribute(VariableEnhanced vds) {
   Attribute cal = vds.findAttribute("calendar");
   return (cal == null) ? null : cal.getStringValue();
 }