On 8/13/07, Angela Williams
<Angela(_dot_)Williams(_at_)the401kcompany(_dot_)com> wrote:
Andrew Welch
So basically always type your parameters - if you're expecting a string
that can be empty then you want:
<xsl:param name="foo" as="xs:string?"/>
...and then using test="not($foo)" should be fine.
In the function below, I've typed my $xpath, but still the empty string
was passed to saxon:evaluate and generated the 'Expected node but
received EOF' message from Saxon. When I changed it to check for
string-length, I received my custom error message.
Did I miss something?
<xsl:function name="fk:eval">
<xsl:param name="context" as="node()+"/>
<xsl:param name="xpath" as="xs:string" />
<xsl:param name="msg" as="xs:string" />
<xsl:choose>
<!-- <xsl:when test="not($xpath)"> -->
<xsl:when test="string-length(normalize-space($xpath)) eq 0">
<xsl:text> Custom error message. </xsl:text>
</xsl:when>
<!-- More code removed -->
<xsl:otherwise>
<xsl:sequence select="$context/sax:evaluate($xpath)" />
</xsl:otherwise>
</xsl:choose>
</xsl:function>
It's almost certainly the value you are passing for the $xpath
parameter is not the empty string '' but ' ' or longer - basically a
string of white space (most likely from getting the string value of a
node in the input and getting white space text nodes)
It's a shame that xs:string('') is allowed (as in '' is considered a
valid xs:string). In nearly all the XML Schemas I write I have to
define my own xs:non-empty-string type and use that wherever I
would've used xs:string. I'm sure there must be a good reason for it,
but it does cause extra hassle.
Anyway, in your case I think you will after all that have to do something like:
not($xpath) or string-length(normalize-space($xpath)) eq 0
or maybe:
not($xpath) or matches($xpath, '\s')
cheers
andrew
--
http://andrewjwelch.com
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