xml - XPath - Select LAST occurence of String -

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i've got tree:

<events>  <properties>    <property descriptor=100>1378314022</property>    <property descriptor=200>abc1234</property>  </properties>  <properties>    <property descriptor=100>1378314023</property>    <property descriptor=200>abc1234</property>  </properties>  <properties>    <property descriptor=100>1378314024</property>    <property descriptor=200>abc1234</property>  </properties>  <properties>    <property descriptor=100>1378314022</property>    <property descriptor=200>123456</property>  </properties>  <properties>    <property descriptor=100>1378314023</property>    <property descriptor=200>123456</property>  </properties>  <properties>    <property descriptor=100>1378314024</property>    <property descriptor=200>123456</property>  </properties>  </events>

how can select <descriptor=200> values no duplicates? example in case need select abc1234 , 123456 once.

update: need iterate @ events level , select distinct strings.

do want last, or no duplicated values?

for no duplicated values:

distinct-values(//property[@descriptor=200])

for last

(//property[@descriptor=200])[last()]

(assuming descriptor property, , lost <property beginning when posting xml, since file posted not valid xml)


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