RE: [xsl] document() function and error-handling

Subject: RE: [xsl] document() function and error-handling
From: "Scott Trenda" <Scott.Trenda@xxxxxxxx>
Date: Thu, 3 Jan 2008 11:17:50 -0600
Robert -
Server-side transformation, so it's hitting the file system. You have a good
idea there, but I couldn't configure the web server like that in the first
place. (huge system, IT throws a fit if we ask for anything to be changed. you
know how it is.)

Michael -
Wish I had an XSLT 2.0 processor available for regular use at work. :/ We've
gone into this debate before, but I'm pretty much stuck with what's here, at
least for now.

That said, does anyone know if MSXML provides a proprietary checking/handling
function, or at least a workaround for this? I ask because I'm also trying to
move a bunch of messy client-side XML.load() handling to server-side XSLT, but
XML.load() handles invalid URIs gracefully, while document() does not. It'd be
nice to be able to do the transformation in one pass, rather than having to do
an intermediate transform simply to check the existance of the file URIs
specified in the document source.

~ Scott

-----Original Message-----
From: Robert Koberg [mailto:rob@xxxxxxxxxx]
Sent: Thursday, January 03, 2008 11:07 AM
To: xsl-list@xxxxxxxxxxxxxxxxxxxxxx
Subject: Re: [xsl] document() function and error-handling

I will assume this is in a web environment. You could configure your web
app/server to return a well-formed error page when you get a 404 (and
disregard it if you want).


-----Original Message-----
From: Michael Kay [mailto:mike@xxxxxxxxxxxx]
Sent: Thursday, January 03, 2008 11:05 AM
To: xsl-list@xxxxxxxxxxxxxxxxxxxxxx
Subject: RE: [xsl] document() function and error-handling

You're right, this question is specific to the processor. XSLT 1.0 makes it
implementation-defined what happens when you ask for a non-existent
document, and there's no mechanism in the standard for testing whether the
document exists or for recovering if it doesn't. XSLT 2.0 has a
doc-available() function for this purpose.

Michael Kay

> -----Original Message-----
> From: Scott Trenda [mailto:Scott.Trenda@xxxxxxxx]
> Sent: 03 January 2008 16:49
> To: xsl-list@xxxxxxxxxxxxxxxxxxxxxx
> Subject: [xsl] document() function and error-handling
> Quick question, might be specific to the MSXML XSLT processor.
> I'm trying to reference two different files passed in as
> parameters to a transformation using the document() function.
> If the files are blank or valid URIs (the URI handling is
> correct), the transformation works as expected, but if the
> URI points to a non-existant file, MSXML errors out with code
> 0x800c0006: "The system cannot locate the object specified."
> I'm developing a central framework for several different
> applications, and I don't know if the application is actually
> going to create the file I'm trying to reference here. If it
> doesn't exist, I don't care, I just want to use it in the
> case that it does exist.
> I've played around with some different scenarios in the
> stylesheet, and the error occurs any time I try to access the
> variable that contains the result of the document() function,
> even if I only want to check if it's non-empty. Is there any
> more graceful way (for MSXML, in particular) to handle the
> case where the URI passed to document() doesn't exist?
> I've included the stylesheet I'm using at the bottom, just in
> case it helps.
> ~ Scott
> <xsl:stylesheet version="1.0"
> xmlns:xsl="";
> xmlns:encodingStyle="
> " exclude-result-prefixes="encodingStyle">
>             <xsl:param name="framework-map-file"/>
>             <xsl:param name="app-map-file"      />
>             <xsl:output method="text" encoding="utf-8"/>
>             <xsl:variable name="framework-maps"
> select="document($framework-map-file)"/>
>             <xsl:variable name="app-maps"      
> select="document($app-map-file      )"/>
>             <xsl:variable name="maps"          
> select="$framework-maps/*/map | $app-maps/*/map"/>
>             <xsl:template match="*">
>                         <xsl:variable name="var-name">
>                                     <xsl:apply-templates
> select="." mode="name"/>
>                         </xsl:variable>
>                         <xsl:for-each
> select="$maps[normalize-space(@new) = $var-name]">
>                                    <xsl:value-of
> select="concat('&lt;webSet #', normalize-space(@old), '# =
> #', $var-name, '#&gt;&#10;')"/>
>                         </xsl:for-each>
>                         <xsl:apply-templates select="*"/>
>             </xsl:template>
>             <xsl:template match="*" mode="name">
>                         <xsl:apply-templates
> select="parent::*" mode="name"/>
>                         <xsl:choose>
>                                     <xsl:when
> test="../@encodingStyle:arrayType">[<xsl:number/>]</xsl:when>
>                                     <xsl:otherwise>
>                                                 <xsl:if
> test="parent::*">.</xsl:if>
>                                                 <xsl:value-of
> select="name()"/>
>                                     </xsl:otherwise>
>                         </xsl:choose>
>             </xsl:template>
> </xsl:stylesheet>

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