powershell - Advanced XPath SelectNodes criteria -


i have reached stumbling point in understanding of xpath. can basic selections without trouble, have need select nodes based on not node part of, based on if contain specific node, , keep finding myself going down path of large selection doing loop , if dance whittle down. , somehow think missing nifty trick in xpath in single statement.

so, given xml below, end set of computer nodes, based on particular location id , presence of particular value in set. so, $location = amsterdam & $set = viz should return a-1 computer, $location = amsterdam & $set = arch should return 3 computers in amsterdam.

so, can done purely in xpath statement? , if not, there nifty powershell pipeline trick? or best bet use xpath address location , loop , if strain out sets?

<management>   <computers>     <location id="amsterdam">       <computer id="a-1">         <conformsets>           <set>arch</set>           <set>viz</set>         </conformsets>       </computer>       <computer id="a-2">         <conformsets>           <set>arch</set>         </conformsets>       </computer>       <computer id="a-3">         <conformsets>           <set>arch</set>         </conformsets>       </computer>     </location>     <location id="berlin">       <computer id="b-1">         <conformsets>           <set>viz</set>         </conformsets>       </computer>       <computer id="b-2">         <conformsets>           <set>arch</set>         </conformsets>       </computer>       <computer id="b-3">         <conformsets>           <set>arch</set>         </conformsets>       </computer>     </location>   </computers> </management>

you can use following xpath form return computer element based on location's id attribute , set descendant element value :

//location[@id='some_id']/computer[conformsets/set='some_set_value']

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