code: def add_linguistic_processor(self, layer, my_lp):
          
          if self.header is None:
              self.header = CHeader(type=self.type)
              self.root.insert(0,self.header.get_node())
          self.header.add_linguistic_processor(layer,my_lp)
docs: Adds a linguistic processor to the header
          @type my_lp: L{Clp}
          @param my_lp: linguistic processor object
          @type layer: string
          @param layer: the layer to which the processor is related to