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updateXML [Oracle SQL]

updateXML (xml-type, 'xpath-expression, new-value)
updateXML (xml-type, 'xpath-expression, new-value, 'namespace')

An example

create table some_xml of xmltype;
A document is inserted into the xml table. After inserting it, the c-element (containing four) should be updated to two. 
insert into some_xml values(xmltype('
<a>
  <b x="1">one</b>
  <c x="2">four</c>
  <d x="3">three</d>
</a>'
));

update some_xml set object_value =
  updateXML(object_value, '/a/*[@x=2]text()', 'two');

select * from some_xml;

SYS_NC_ROWINFO$
--------------------------------
<a>
  <b x="1">one</b>
  <c x="2">two</c>
  <d x="3">three</d>
</a>