XSL experts,
I have an XSL which loops over a set of elements in search of links
and creates a result document for the link. In some cases there is
more than one link to the same anticipated document, so I use the doc-
available() to test first for its existence before creating the
file. This is intended to avoid a DynamicError related to writing
more than one result document to the same URI.
However, when I run the program against a large set of documents
after 10 minutes or so I get the DynamicError. Below is the output
(run via ant) along with some debugging fields I'll explain in a moment:
[xslt] test for doc /Users/dgran/dev/rose/build/zoom/
1-1861.wrenn.320-321.img.html available: false
[xslt] creating file: /Users/dgran/dev/rose/build/
zoom/1-1861.wrenn.320-321.img.html
[xslt] test for doc /Users/dgran/dev/rose/build/zoom/
1-1861.wrenn.320-321.img.html available: false
[xslt] creating file: /Users/dgran/dev/rose/build/
zoom/1-1861.wrenn.320-321.img.html
[xslt] Failed to process /Users/dgran/dev/rose/deploy.temporary/
1-1861.wrenn.rad.xml
BUILD FAILED
/Users/dgran/dev/rose/build.xml:395: The following error occurred
while executing this line:
/Users/dgran/dev/rose/build.xml:77: net.sf.saxon.trans.DynamicError:
Cannot write more than one result document to the same URI: file:/
Users/dgran/dev/rose/build/zoom/1-1861.wrenn.320-321.img.html
In the first case, the file (1-1861.wrenn.320-321.img.html) is
correctly created because it doesn't exist yet. In the second case
the doc-available() method should return true and skip the result-
document command, but it fails to work. My hypothesis is that the
result-document() method isn't finished flushing before the call to
doc-available() is made.
Assuming my guess is correct, is there a way in XSL to assure that
the document is finished writing before continuing to the next
iteration in the loop? Maybe there is another way of skinning this
cat. I welcome suggestions. I'm using Saxon 8-7-3j. Below is a
simplified version of my stylesheet:
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform";
version="2.0">
<xsl:template match="/">
<xsl:for-each select="ram|//repro|//page|//figure">
<xsl:variable name="zoomhtml">
<xsl:text>build/zoom/</xsl:text>
<xsl:value-of select="@image"/>
<xsl:text>.img.html</xsl:text>
</xsl:variable>
<xsl:message>
test for doc <xsl:value-of select="$zoomhtml"/> available:
<xsl:value-of select="doc-available($zoomhtml)"/>
</xsl:message>
<xsl:choose>
<xsl:when test="doc-available($zoomhtml)"/>
<xsl:otherwise>
<xsl:message> creating file: <xsl:value-of
select="$zoomhtml"/>
</xsl:message>
<xsl:result-document href="$zoomhtml"> </xsl:result-document>
</xsl:otherwise>
</xsl:choose>
</xsl:for-each>
</xsl:template>
</xsl:stylesheet>
Duane Gran
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