code: public boolean remove(String attribute, String value) {
  	NameOpValue nv = rslTree.getParam(attribute);
  	if (nv == null || nv.getOperator() != NameOpValue.EQ) return false;
  	return nv.remove(new Value(value));
      }
docs: Removes a specific value from a list of values of the specified
  attribute.
  
  @param attribute the attribute from which to remote the value from.
  @param value the specific value to remove.
  @return true if the value was successfully removed. Otherwise,
  returns false,