code: def currentSchemaPath(self):
          
          item = self.currentItem()
          path = []
          while item:
              path.append(nativestring(item.text(0)))
              item = item.parent()
          
          return '.'.join(reversed(path))
docs: Returns the column path for the current item.  This will be a '.'
          joined path based on the root schema to the given column.
          
          :return     <str>