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In other words, you can do things like: She means that lower-case(.) returns a string, not a node-set. It is not possible to continue the path with / if the previous steps didn't result in a node-set. So this can be done: keyword/key('nodes-by-keyword', .)/substring-before(., '-') ..as key() returns a node-set. But this cannot be done: keyword/lower-case(.)/substring-before(., '-') ..as lower-case() returns a string. (Unless you can make lower-case return Text Nodes instead of Strings, I guess..) Grtz
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