code: public boolean isMetBy(LocalProperties other) {
  		if (this.ordering != null) {
  			// we demand an ordering
  			return other.getOrdering() != null && this.ordering.isMetBy(other.getOrdering());
  		} else if (this.groupedFields != null) {
  			// check if the other fields are unique
  			if (other.getGroupedFields() != null && other.getGroupedFields().isValidUnorderedPrefix(this.groupedFields)) {
  				return true;
  			} else  {
  				return other.areFieldsUnique(this.groupedFields);
  			}
  		} else {
  			return true;
  		}
  	}
docs: Checks, if this set of properties, as interesting properties, is met by the given
  properties.
  
  @param other
  The properties for which to check whether they meet these properties.
  @return True, if the properties are met, false otherwise.