Thank you for your response Ken, but as said Michael my question was
about "always supplied parameters".
But this make me think about another question : if no parameters is
supplied, I'm use to test it againts empty string with
<xsl:if test="$foo=''"/>
and it usually works.
Is an empty sequence equal to an emty string?
(maybe the equal operator tries to cast both part to the same type ?
The '=' operator compares two sequences, and returns true if there is a
pair of values, one from each sequence, that are equal to each other. If
one of the sequences is empty, the result will always be false.
However, I may have misinformed you in my previous response. The
specification says:
"If an optional parameter has no select attribute and has an empty
sequence constructor, and if there is no as attribute, then the default
value of the parameter is a zero length string."
This is why the test $foo='' is working for you.
The default value changes to an empty sequence if an "as" attribute is
present to declare the type. In this case the test to apply is
test="empty($foo)".
Michael Kay
Saxonica
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