.net - XPath to get the element with the highest ID -

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xml source:

<documents>     <document>         <id>3</id>     </document>     <document>         <id>7</id>     </document>     <document>         <id>1</id>     </document> </documents>

i need document-element highest value in id-element (so <document><id>7</id></document> in example). can't change c# code, xmldocument.selectsinglenode(...), can modify xpath used.

is there documents/document[id=max(id)] or order id descending it?

documents/document[not(../document/id > id)]

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