code: public SelectBuilder attributeset(final String _attribute,
                                        final String _where)
      {
          addPoint();
          this.bldr.append("attributeset[").append(_attribute);
          if (_where != null) {
              this.bldr.append("|").append(_where);
          }
          this.bldr.append("]");
          return this;
      }
docs: Attributeset.
  
  @param _attribute attribute to be added
  @param _where the where
  @return this