Example of edges for the TinkerPop airports dataset http://kelvinlawrence.net/book/Gremlin-Graph-Guide.html#samplesintro

gistfile1.xml

<graphml xmlns='http://graphml.graphdrawing.org/xmlns'>
  <key id='type'    for='node' attr.name='type'    attr.type='string'></key>
  <key id='code'    for='node' attr.name='code'    attr.type='string'></key>
  <key id='icao'    for='node' attr.name='icao'    attr.type='string'></key>
  <key id='desc'    for='node' attr.name='desc'    attr.type='string'></key>
  <key id='region'  for='node' attr.name='region'  attr.type='string'></key>
  <key id='runways' for='node' attr.name='runways' attr.type='int'></key>
  <key id='longest' for='node' attr.name='longest' attr.type='int'></key>
  <key id='elev'    for='node' attr.name='elev'    attr.type='int'></key>
  <key id='country' for='node' attr.name='country' attr.type='string'></key>
  <key id='city'    for='node' attr.name='city'    attr.type='string'></key>
  <key id='lat'     for='node' attr.name='lat'     attr.type='double'></key>
  <key id='lon'     for='node' attr.name='lon'     attr.type='double'></key>
  <key id='dist'    for='edge' attr.name='dist'    attr.type='int'></key>
  <key id='labelV'  for='node' attr.name='labelV'  attr.type='string'></key>
  <key id='labelE'  for='edge' attr.name='labelE'  attr.type='string'></key>

  <graph id='routes' edgedefault='directed'>
  <node id='0'>
    <data key='labelV'>version</data>
    <data key='type'>version</data>
    <data key='code'>0.77</data>
    <data key='desc'>Version: 0.77 Generated: 2017-10-06 16:24:40 UTC
Graph created by Kelvin R. Lawrence
Please let me know of any errors you find in the graph.</data>
  </node>
    
    <node id='49'>
    <data key='labelV'>airport</data>
    <data key='type'>airport</data>
    <data key='code'>LHR</data>
    <data key='icao'>EGLL</data>
    <data key='city'>London</data>
    <data key='desc'>London Heathrow</data>
    <data key='region'>GB-ENG</data>
    <data key='runways'>2</data>
    <data key='longest'>12799</data>
    <data key='elev'>83</data>
    <data key='country'>UK</data>
    <data key='lat'>51.4706001282</data>
    <data key='lon'>-0.461941003799</data>
  </node>

  <node id='3612'>
    <data key='type'>continent</data>
    <data key='code'>EU</data>
    <data key='desc'>Europe</data>
    <data key='labelV'>continent</data>
  </node>
  
  <edge id='50441' source='3612' target='49'>
    <data key='labelE'>contains</data>
  </edge>  
  
  <edge id='4946' source='1' target='49'>
    <data key='labelE'>route</data>
    <data key='dist'>4198</data>
  </edge>
    
  <node id='3598'>
    <data key='type'>country</data>
    <data key='code'>UK</data>
    <data key='desc'>United Kingdom</data>
    <data key='labelV'>country</data>
  </node>

  <edge id='47067' source='3598' target='49'>
    <data key='labelE'>contains</data>
  </edge>