text: def to_mdtraj_Topology(item, selection='all', frame_indices='all', syntaxis='MolSysMT'):
  
      from molsysmt.tools.parmed_GromacsTopologyFile import is_parmed_GromacsTopologyFile
      from molsysmt.basic import convert
  
      if not is_parmed_GromacsTopologyFile(item):
          raise ValueError
  
      tmp_item = convert(item, to_form='mdtraj_Topology', selection=selection,
              frame_indices=frame_indices, syntaxis=syntaxis)
  
      return tmp_item
  
  