How can I get wildcards to work in XPath attribute value matching?

I have the following XML: ``` <root> <foo> <bar type="a whole bunch of stuff, then a magic string: MUPPET" /> <value>my Muppet value</value> </foo> <foo> <bar type="some other stuff, then a different magic string: GREMLIN" /> <value>my Gremlin value</value> </foo> </root> ``` I'd like to build an XPath query that returns "my Muppet value" (the string) given the magic string "MUPPET". My guess was: ``` /root/foo[contains(bar/@type,'MUPPET')]/value/text() ``` but that doesn't seem to work. I'm really not sure whether that `contains(x,y)` operator allows a query as the first parameter. As a side issue, I'm not sure whether I need the `text()` on the end. Any help?