Multivalued Fields - NASA-PDS/product_relationships GitHub Wiki

Use the same property multiple times

<urn:nasa:pds:context:investigation:mission.orex>
  <pds:lid_ref> <urn:nasa:pds:context:instrument_host:spacecraft.orex>;
  <pds:lid_ref> <urn:nasa:pds:context:instrument:tagcams.orex>;
  <pds:lid_ref> <urn:nasa:pds:context:target:asteroid.101955_bennu>.