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RE: [xsl] Encoding of xsl:message output

2010-05-21 07:53:51

Because you asked a related question on the Saxon list, I didn't actually
notice that this question was on the xsl-list and expressed more generally.
The general answer is that when the spec says that the destination and
format of xsl:message output are implementation-defined, it means that the
way in which you control these things, if at all, is using mechanisms that
are specific to your product.

Regards,

Michael Kay
http://www.saxonica.com/
http://twitter.com/michaelhkay 



I understand there are a few things left as >implementation 
defined< 
in XSLT 2.0, at the same time I feel I might have overlooked 
something.

Can I somehow influence the encoding used by xsl:message output?


By default Saxon sends xsl:message output to a Java 
OutputStreamWriter over the standard error output; the Java 
library, as far as I know, will typically use the platform 
default encoding. There's a note in the code that this has 
been known to fail on .NET when the default encoding set for 
the .NET environment is one that the Java runtime doesn't 
recognize; if it fails, Saxon tries again specifying UTF8 as 
the encoding.

I'm not quite sure how IKVM does this mapping; on .NET 
System.Console.Error is a TextWriter, so we should probably 
be writing character data to it rather than binary data in an 
encoding decided by the Java class library.
Perhaps Saxon needs an abstraction layer here.

In the meantime, of course, you can of course take full 
control of the destination of message output, as well as its 
format, by means of various hooks at the level of the s9api 
XsltTransformer or the underlying net.sf.saxon.Controller.

Regards,

Michael Kay
http://www.saxonica.com/
http://twitter.com/michaelhkay  


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