code: public static TagAttributeInfo getIdAttribute(TagAttributeInfo a[]) {
          for (int i=0; i<a.length; i++) {
              if (a[i].getName().equals(ID)) {
                  return a[i];
              }
          }
          return null;		// no such attribute
      }
docs: Convenience static method that goes through an array of TagAttributeInfo
  objects and looks for "id".
  
  @param a An array of TagAttributeInfo
  @return The TagAttributeInfo reference with name "id"