Ok, here’s a way using Saxon 9:
<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform";
xmlns:db="http://docbook.org/ns/docbook";
xmlns:file="java.io.File"
version="2.0">
<xsl:template match="db:imagedata">
<xsl:message><xsl:value-of select="@fileref"/>: <xsl:value-of
select="file:exists(file:new(resolve-uri(@fileref,
base-uri(.))))"/></xsl:message><!--True if it’s there False if it’s not -->
</xsl:template>
</xsl:stylesheet>
David
From: Cramer, David W (David) [mailto:[email protected]]
Sent: Wednesday, October 20, 2010 4:45 PM
To: chris snow
Cc: [email protected]; Jim Campbell
Subject: RE: [docbook] how to throw error if imagedata not found
Oops..I wasn’t thinking. That will only work if all your images are svg
files…you’ll errors asking it to parse binary files :-)
Sorry for the noise,
David
From: Cramer, David W (David) [mailto:[email protected]]
Sent: Wednesday, October 20, 2010 4:13 PM
To: chris snow
Cc: [email protected]; Jim Campbell
Subject: RE: [docbook] how to throw error if imagedata not found
Hi Chris,
Btw, I ran across a potentially better answer to your question (depending on
the behavior of your xslt processor):
http://www.dpawson.co.uk/xsl/sect2/N2602.html#d3859e19
David
From: Cramer, David W (David) [mailto:[email protected]]
Sent: Wednesday, October 13, 2010 11:42 AM
To: Jim Campbell; chris snow
Cc: [email protected]
Subject: RE: [docbook] how to throw error if imagedata not found
Hi Chris,
Here’s what we do:
The build runs an xslt that produces a list of images used. Ant then checks to
make sure all are the images available and kills with a useful error message
the build if any are missing. To avoid an annoying build/fail/fix/repeat cycle,
the error message shows all missing images rather than only listing the first
missing image it finds.
I think to do something like this within the xslt would require that you write
an extension/call out to java.
David
From: [email protected] [mailto:[email protected]] On Behalf Of Jim
Campbell
Sent: Wednesday, October 13, 2010 11:27 AM
To: chris snow
Cc: [email protected]
Subject: Re: [docbook] how to throw error if imagedata not found
Hi there, Chris,
On Wed, Oct 13, 2010 at 9:16 AM, chris snow
<[email protected]<mailto:[email protected]>> wrote:
Is it possible for an error to be thrown during processing if a file
referred to by imagedata is not found?
<mediaobject>
<imageobject>
<imagedata fileref="../../images/coding-cycle.png"/>
</imageobject>
</mediaobject>
Many thanks,
Chris
It might not be exactly what you are looking for, but one option would be to
include the image via an xinclude mechanism, and then include a xinclude
fallback. It might go something like this:
<mediaobject>
<imageobject>
<xi:include fileref="../../images/coding-cycle.png">
<xi:fallback>Image file is unavailable.</xi:fallback>
</xi:include>
</imageobject>
</mediaobject>
You would need to use a DTD or schema (or at least a DTD fragment) that allows
for use of xinclude.
I hope this helps,
Jim
