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<address id="34567">
 <phone>123</phone>
...
 <zip>123456789</zip>
 <city>Hooterville</city>
</address>

<address id="34567" mode="update">
 <phone>456</phone>
 <!-- note the absence of other nodes -->
</address>

UPDATE address SET
 phone="456",
...
 zip=zip,
 city=city
WHERE ID="34567"