Python XPath with ElementTree Invalidate Predicate -


i have probleme max value of categorylevel write says invalidate predicate.

document=xmlparser.parse("categories.xml")

xpathquery="{0}categoryarray/{0}category[not({0}categoryarray/{0}category/{0}categorylevel>{0}categorylevel)]".format(namespace)  categories=root.find(xpathquery)

the xml file

<getcategoriesresponse xmlns="urn:xxxxxxxx:xxxxx:xxxxxxxx"> <categoryarray>     <category>                   <categorylevel>1</categorylevel>                 </category>     <category>         <categorylevel>2</categorylevel>         </category>     <category>                   <categorylevel>3</categorylevel>                 </category>     <category>         <categorylevel>2</categorylevel>         </category>

i want check if xpath query suitable extract maximum value of categorylevel or not, , don't understand answer of other post. please tell me source of error?! cordially


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