GML

<abs:addressMember>
  <abs:Address gml:id="uk.addressbase.uprn.100040205844">
    <abs:uprn>100040205844</abs:uprn>
    <abs:osAddressTOID>osgb1000002274362298</abs:osAddressTOID>
    <abs:udprn>8782432</abs:udprn>
    <abs:subBuildingName xml:lang="en">FLAT C</abs:subBuildingName>
    <abs:buildingName xml:lang="en">PEMBROKE HOUSE</abs:buildingName>
    <abs:buildingNumber>4</abs:buildingNumber>
    <abs:thoroughfare xml:lang="en">BYSTOCK TERRACE</abs:thoroughfare>
    <abs:postTown xml:lang="en">EXETER</abs:postTown>
    <abs:postcode>EX4 4HY</abs:postcode>
    <abs:postcodeType>S</abs:postcodeType>
    <abs:position>
      <gml:Point srsName="urn:ogc:def:crs:EPSG::27700" gml:id="uk.addressbase.uprn.p.100040205844">
        <gml:pos>291640.00 93040.00</gml:pos>
      </gml:Point>
    </abs:position>
    <abs:positionLatLong>
      <gml:Point srsName="urn:ogc:def:crs:EPSG::4258" gml:id="uk.addressbase.uprn.pl.100040205844">
        <gml:pos>50.7268511 -3.5366289</gml:pos>
      </gml:Point>
    </abs:positionLatLong>
    <abs:rpc>1</abs:rpc>
    <abs:country>E</abs:country>
    <abs:changeType>I</abs:changeType>
    <abs:laStartDate>2001-04-04</abs:laStartDate>
    <abs:rmStartDate>2001-04-04</abs:rmStartDate>
    <abs:lastUpdateDate>2001-04-04</abs:lastUpdateDate>
    <abs:class>R</abs:class>
  </abs:Address>
</abs:addressMember>

Changed fields are highlighted in red.
<abs:addressMember>
  <abs:Address gml:id="uk.addressbase.uprn.100040205844">
    <abs:uprn>100040205844</abs:uprn>
    <abs:osAddressTOID>osgb1000002274362298</abs:osAddressTOID>
    <abs:udprn>8782432</abs:udprn>
    <abs:subBuildingName xml:lang="en">FLAT C</abs:subBuildingName>
    <abs:buildingName xml:lang="en">PEMBROKE HOUSE</abs:buildingName>
    <abs:buildingNumber>4</abs:buildingNumber>
    <abs:thoroughfare xml:lang="en">BYSTOCK TERRACE</abs:thoroughfare>
    <abs:postTown xml:lang="en">EXETER</abs:postTown>
    <abs:postcode>EX4 4HY</abs:postcode>
    <abs:postcodeType>S</abs:postcodeType>
    <abs:position>
      <gml:Point srsName="urn:ogc:def:crs:EPSG::27700" gml:id="uk.addressbase.uprn.p.100040205844">
        <gml:pos>291640.00 93040.00</gml:pos>
      </gml:Point>
    </abs:position>
    <abs:positionLatLong>
      <gml:Point srsName="urn:ogc:def:crs:EPSG::4258" gml:id="uk.addressbase.uprn.pl.100040205844">
        <gml:pos>50.7268511 -3.5366289</gml:pos>
      </gml:Point>
    </abs:positionLatLong>
    <abs:rpc>2</abs:rpc>
    <abs:country>E</abs:country>
    <abs:changeType>U</abs:changeType>
    <abs:laStartDate>2001-04-04</abs:laStartDate>
    <abs:rmStartDate>2001-04-04</abs:rmStartDate>
    <abs:lastUpdateDate>2010-06-04</abs:lastUpdateDate>
    <abs:class>R</abs:class>
  </abs:Address>
</abs:addressMember>