Re: Testing the existence of a binary file (was: How t

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Subject: Re: Testing the existence of a binary file (was: How to specify 'raw' encoding in xslt:unparsed-text-available?)
From: "Imsieke, Gerrit, le-tex" <gerrit.imsieke@xxxxxxxxx>
Date: Sun, 14 Feb 2010 11:56:43 +0100

Since nobody answered, I tried to come up with a solution on my own.

It seems that in Java there is no such thing as a 'raw' encoding, since everything will be represented as 16-bit Unicode characters internally. http://java.sun.com/javase/7/docs/api/java/nio/charset/CharsetDecoder.html If I supplied my own CharsetDecoder, maybe I could just ignore malformed input and unmappable characters and report success for any input of non-zero length. But I was looking for a solution that works with Saxon out of the box, not requiring users to install Java extension functions.

Looking at what I was trying to achieve, that is: testing the sheer existence of a binary file, rather than reading its raw contents, I came up with the following solution:

<sch:assert test="saxon:try( format-dateTime( saxon:last-modified( resolve-uri( @src, $base-uri ) ), '[Y]' ), false() )" id="ImageMissing"> Image <sch:value-of select="@src"/> must be present at its @src location. </sch:assert>

This relies on the operating system reporting a last change date for the file in question, and of course on Saxon's built-in extension functions which will be an issue for Saxon HE users.

Gerrit

On 05.02.2010 10:21, Imsieke, Gerrit, le-tex wrote:

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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Gerrit Imsieke
Geschdftsf|hrer / Managing Director
le-tex publishing services GmbH
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Phone +49 341 355356 110, Fax +49 341 355356 510
gerrit.imsieke@xxxxxxxxx, http://www.le-tex.de

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Geschdftsf|hrer: Gerrit Imsieke, Svea Jelonek,
Thomas Schmidt, Dr. Reinhard Vvckler

Current Thread
How to specify 'raw' encoding in xslt:unparsed-text-available (for, e.g., images)? Imsieke, Gerrit, le-tex - 5 Feb 2010 09:21:44 -0000 Imsieke, Gerrit, le-tex - 14 Feb 2010 10:57:18 -0000 <= Stefan Krause - 14 Feb 2010 12:56:04 -0000 Imsieke, Gerrit, le-tex - 14 Feb 2010 14:10:47 -0000

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