oasis xml catalog. how to use?

["Richard Bourner" <rbourner@OpTechSoftware.com>]

hi,

does someone have an idea why the line defining my catalog
is not read?
My catalog file is located in the same directory as my sample.xml

I am using Xerces SAXParser 2.4.0

Is there something special to do so that the catalog declaration
is taken into account when the parser is in action?



<!-- Content of sample.xml  -->
<?xml version="1.0"?>
<?oasis-xml-catalog catalog="./catalog.xml"?>

<!DOCTYPE Book SYSTEM "http://www.site.com/Book.dtd";>
<Book>
	...
</Book>


Thanks for your help.



Richard