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Hello Gerrit,

if java is accessible in your environment, you can use the following
function:

<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet
	version="2.0"
	xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
	xmlns:xs="http://www.w3.org/2001/XMLSchema"
	xmlns:java-file="java:java.io.File"
	xmlns:java-uri="java:java.net.URI"
	xmlns:misc="someURI"
	>
	<xsl:function name="misc:file-exists" as="xs:boolean">
		<xsl:param name="uri" as="xs:string?"/>
		<xsl:value-of
select="java-file:exists(java-file:new(java-uri:new($uri)))"/>
	</xsl:function>
</xsl:stylesheet>

I ended up with this solution, because it only depends on the
availability of java (it works also with AltovaXML), and there was some
changes in the support of saxon:last-modified/saxon:file-last-modified
during the saxon revisions.

I don't know how it's fit to Schematron, but maybe you find a way.

Best regards,

Stefan


Imsieke, Gerrit, le-tex schrieb:
> 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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