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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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