[xsl] How to specify 'raw' encoding in xslt:unparsed-text-available (for, e.g., images)?

Subject: [xsl] How to specify 'raw' encoding in xslt:unparsed-text-available (for, e.g., images)?
From: "Imsieke, Gerrit, le-tex" <gerrit.imsieke@xxxxxxxxx>
Date: Fri, 05 Feb 2010 10:21:00 +0100
Dear List Members,

In Schematron using the xslt2 binding, I want to check whether image files (whose relative path is given in a @src attribute) are present.

So in the generated XSLT file, I have code like the following.

<xsl:when test="unparsed-text-available(resolve-uri(@src, $base-uri))"/>

This works fine if @src refers to text files in US-ASCII or UTF-8 encodings, but not for PNGs oder JPEGs.

So I was looking for an encoding name that I can use as the second argument to unparsed-text-available. But I couldn't find an encoding such as RAW or BINARY that Java accepts (I'm using saxon 9.2.0.3 on Java 1.6.0_17).

This issue must have been raised before, but unfortunately I didn't find previous threads on this matter.

Any hints appreciated.

Gerrit

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