XPath to identify a parent based on two related children -

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using following example, trying create xpath identify id of apples branchid matches id of branch, treeid doesn't match branch's treeid.

for instance: //growth[@type="apple"][branchid=//branch/@id]/@id - results granny empire gala

and //growth[@type="apple"][treeid!=//branch/treeid]/@id - results granny empire gala

but want query return: granny

<xml>   <growth type="apple" id="granny">    <branchid>abcd</branchid>    <treeid>456</treeid>   </growth>   <growth type="apple" id="empire">    <branchid>abcd</branchid>    <treeid>123</treeid>   </growth>   <growth type="apple" id="gala">    <branchid>efgh</branchid>    <treeid>456</treeid>   </growth>   <growth type="flower" id="white">    <branchid>efgh</branchid>    <treeid>123</treeid>   </growth>   <growth type="flower" id="yellow">    <branchid>abcd</branchid>    <treeid>456</treeid>   </growth>   <branch id="abcd">    <treeid>123</treeid>   </branch>   <branch id="efgh">     <treeid>456</treeid>   </branch>   <tree id="123" />   <tree id="456" />   <tree id="789" />  </xml>

so required item(s) (where branchid/treeid pair not exist in branch element) have different index values branchid in list of //branch/@id values , treeid in list of //branch/treeid values...

//growth[@type="apple"][index-of(//branch/@id,branchid)!=index-of(//branch/treeid,treeid)]/@id  granny

nice question give little grey cells exercise on friday lunchtime :o)


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