Need help in xpath

[GringoRk]

I have this xml:\[code\] <mappings> <mapping> <name iskey="true">234</name> <aid iskey="true">bmz</aid> <bid iskey="true">sim</bid> <data>GSSS</data> </mapping> <mapping> <aid iskey="true">bmz</aid> <bid iskey="true">sim</bid> <data>TS</data> </mapping> <mapping> <aid iskey="true">bmz</aid> <account>TS</account> </mapping> </mappings> \[/code\]\[quote\] I need the xpath to select the node which has node \[code\]<aid iskey='true'>bmz</aid>\[/code\] and no other node containing iskey attribute. \[/quote\]