new_contents: 
  def handle_ltop_links(dmrs_xml):
      '''
      Remove LTOP links from DMRS and add LTOP attribute to the DMRS entity
      :param dmrs_xml: Input DMRS XML
      :return: Modified DMRS XML
      '''
  
      ltop = '-1'
      links_to_remove = list()
      for entity in dmrs_xml:
  
          if entity.tag == 'link':
              link = entity
  
              # Remove LTOP (ghost) link
              if link.attrib['from'] == '0':
                  links_to_remove.append(link)
                  ltop = link.attrib['to']
  
      for link in links_to_remove:
          dmrs_xml.remove(link)
  
      dmrs_xml.attrib['LTOP'] = ltop
      del dmrs_xml.attrib['index']
  
      return dmrs_xml
  
subject: Attach LTOP as the attribute and remove index