code: def element_info(cls_or_slf, node, siblings, level, value_dims):
          
          info = cls_or_slf.component_type(node)
          if len(node.kdims) >= 1:
              info += cls_or_slf.tab + '[%s]' % ','.join(d.name for d in node.kdims)
          if value_dims and len(node.vdims) >= 1:
              info += cls_or_slf.tab + '(%s)' % ','.join(d.name for d in node.vdims)
          return level, [(level, info)]
docs: Return the information summary for an Element. This consists
          of the dotted name followed by an value dimension names.