XML Catalogs don't work with Saxon?

[Brian Burridge <brian@burridge.net>]

When I run my stylesheet with XML Catalogs, everything works fine until
it gets to processing the docbookx.dtd itself. Then it crashes on
dbnotnx.mod. Here is the output:

resolveSystem(http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd)
Resolved system: http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd
        file:/home/bburridg/IBM/wsappdev/DocBook/DocBook/docbookx.dtd
resolveSystem(file:/home/bburridg/IBM/wsappdev/DocBook/DocBook/DesignDocument/dbnotnx.mod)
resolvePublic(-//OASIS//ENTITIES DocBook Notations
V4.2//EN,file:/home/bburridg/IBM/wsappdev/DocBook/DocBook/DesignDocument/dbnotnx.mod)
Error on line 99 column 1 of
file:/home/bburridg/IBM/wsappdev/DocBook/DocBook/DesignDocument/FAR2DesignDocument.xml:
  Error reported by XML parser: Cannot read from
file:/home/bburridg/IBM/wsappdev/DocBook/DocBook/DesignDocument/dbnotnx.mod (/home/bburridg/IBM/wsappdev/DocBook/DocBook/DesignDocument/dbnotnx.mod (No such file or directory))
Transformation failed: Run-time errors were reported

Brian