A suggestion that I've thought about from time to time:
If an attribute in XSLT expects an expression or an AVT, then a leading
undoubled "}" in the attribute value indicates that is to be treated as a plain
string.
So for an expression
<xsl:param name="x" select="}O'Reilly"/>
indicates that the default value is the string "O'Reilly"
and in an AVT
regex="}[a-z]{4}"
indicates that the regex is [a-z]{4}
This relies on the fact that neither an AVT nor an expression can legally begin
with an undoubled "}", nor is it ever likely to. And you can think of "}" as
meaning "exit expression mode, here is plain text".
Nice idea, or just too quirky?
Michael Kay
Saxonica
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