code: def is_continuous(docgraph, dominating_node):
      
      first_onset, last_offset = get_span_offsets(docgraph, dominating_node)
      span_range = xrange(first_onset, last_offset+1)
  
      token_offsets = (docgraph.get_offsets(tok)
                       for tok in get_span(docgraph, dominating_node))
      char_positions = set(itertools.chain.from_iterable(xrange(on, off+1)
                           for on, off in token_offsets))
      for item in span_range:
          if item not in char_positions:
              return False
      return True
docs: return True, if the tokens dominated by the given node are all adjacent