xml - Xpath2.0 selecting first and last occurance of string with iteration -

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i have 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>

i'm iterating @ level: events/properties

how can have first , last occurrence of each property descriptor = 200 , respective property descriptor = 100?

i've tried far:

  • iteration: events/properties
  • select: property[@descriptor=200])[last()] or property[@descriptor=200])[first()]

but no success.

output should [i'm showing in html, iterating in row level]:

p100        | p200 1378314022  | abc1234 1378314024  | abc1234 1378314022  | 123456 1378314024  | 123456

in xslt 2.0 easy for-each-group, grouping 200 value , taking first , last members of each group. in pure xpath (not xslt) need think laterally.

if groups contiguous you've shown here (i.e. abc1234 entries adjacent 1 another, , 123456 entries adjacent 1 another) boils down wanting every properties element p not have preceding and following sibling properties element same 200 value p. i.e. want iterate over

events/properties[not(   (     property[@descriptor="200"] =     preceding-sibling::properties[1]/property[@descriptor="200"]   ) , (     property[@descriptor="200"] =     following-sibling::properties[1]/property[@descriptor="200"]   ) )]

and select property[@descriptor="100"] , property[@descriptor="200"] each of resulting properties elements.

you've tagged question "xpath-2.0" expression valid in xpath 1.0.


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