code: public boolean removeElement(int s)
    {
  
      if (!m_mutable)
        throw new RuntimeException(XSLMessages.createXPATHMessage(XPATHErrorResources.ER_NODESETDTM_NOT_MUTABLE, null)); //"This NodeSetDTM is not mutable!");
  
      return super.removeElement(s);
    }
docs: Removes the first occurrence of the argument from this vector.
  If the object is found in this vector, each component in the vector
  with an index greater or equal to the object's index is shifted
  downward to have an index one smaller than the value it had
  previously.
  
  @param s The node to be removed.
  
  @return True if the node was successfully removed
  @throws RuntimeException thrown if this NodeSetDTM is not of
  a mutable type.