I have used xsl:message several times to debug my files or test
intermediary output. But I wasnt aware that I could actually
store these
messages in some file. Could you either tell me how to do it
or point me
to some web page where I can read some more ?
The simplest answer is to redirect standard error output from the command
line, using
2>messages.xml
However, this will divert all error output, including real error messages,
warnings, etc. A better solution is to redirect the message output
selectively. You can do this from Java but not from the command line.
You probably have to dive into the Saxon Javadoc for documentation.
If you use JAXP with Saxon, you can cast the Transformer object to a
net.sf.saxon.Controller.
http://www.saxonica.com/documentation/javadoc/net/sf/saxon/Controller.html
The Controller has a method setMessageEmitter() which you can use to capture
all xsl:message output if you want to go that far. More simply, you can call
getMessageEmitter() which will return a net.sf.saxon.event.MessageEmitter
http://www.saxonica.com/documentation/javadoc/net/sf/saxon/event/MessageEmit
ter.html
which has a setWriter() method that you can use to set the output
destination to a Writer of your own choosing (or perhaps more simply, a
setStreamResult() method.)
(Note, recent versions of JAXP specify that message output should be sent to
the ErrorListener, which I believe is the Xalan convention. Saxon doesn't
follow this convention. In general, the content of an xsl:message is XML
rather than merely text, and the ErrorListener is only able to handle text.
The MessageEmitter receives the message as XML, in event form.)
Michael Kay
http://www.saxonica.com/
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