RE: document() function using variable

> document('/folder/folder2/$nm.xml')/title doesn't work. 

Despite the use of "$" to prefix a variable name, XSLT variables do not work
by textual substitution. A variable reference is an expression, which can
only be used in a place where you might use a function call (for example).
So, as others have indicated, you need to build the string using concat().

Michael Kay
http://www.saxonica.com/