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A processor is not required to be able to interpret an xsl-stylesheet processing instruction, nor is it required to be able to process the target ID followed by the hash-tag. I propose therefore to add a dependency, say "xsl-stylesheet-processing-instruction" which means that, if supported, the processor supports the XML Stylesheet standard (http://www.w3.org/TR/xml-stylesheet/). This will be a change to the catalog.xsd.
Changes applied tentatively, leaving open for others to comment.
Resolving this bug as fixed per the previous comment.
Closing, no objections.