It is nice that we with XSLT 2.0 schema-awareness can test if our
output is valid, e.g. that it is valid XHTML, and that the
transformation stops if it is not.
I have tested the concept with XMLSpy 2007 and SAXON 8SA as
implemented in Oxygen and it raises several questions.
In XMPSpy there is a bug. The XML Schema schema of XHTML is not
imported if http is used, but XMLSpy works if I download the schema to
my harddisk and use a relative URL. Altova has accepted that there is
In SAXON as implemented in Oxygen it works but it took half a day to
find out that default settings of SAXON in Oxygen is that the input
document is also validated. That is the transformation only works if
your input document is also XHTML or if you also import the schema of
the input document or if you turn the validation of input documents
off in some configuration menu of OXYGEN. Nice with all those options
but I found it a bit confusing.
Here is my question. The spec tells us that the default-validation
attribute of the stylesheet element can only have the values "strip"
and "preserve". OXYGEN proposes those values but some tooltip is also
telling us that we can use the values "strict" and "lax". That is what
Michael Kay is also telling us in his book XSLT 2.0 based on early
The amazing thing is, that if I use "strict" as value in the
default-validation attribute of the stylesheet element, SAXON works
much better than if the result-document's validation attribute is
Now I don't even have to try to make a transformation in order to be
warned of validation errors in my XHTML. I am told about validation
errors right away, and the validation error message is also much
My test stylesheet does not make use of anything in the input
document, any input document should work.
<xsl:result-document exclude-result-prefixes="xs" href="myxhtml.html"
doctype-public="-//W3C//DTD XHTML 1.0 Strict//EN"
<title>Great XHTML test</title>
<h1>Great XHTML test</h1>
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