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From Michael Glavassevich <mrgla...@ca.ibm.com>
Subject Re: resolver should be able to parse catalog files without needing to resolve external entities?
Date Thu, 29 Oct 2009 21:10:39 GMT

Jack Bates <ms419@freezone.co.uk> wrote on 10/28/2009 07:48:23 PM:

> On Sat, 2009-10-24 at 15:10 -0400, Michael Glavassevich wrote:
> > The OASIS catalog DTD is included in resolver.jar and there is a
> > BootstrapResolver [1] which gets installed on the parser that reads
> > the catalog which can return this DTD. I'm sure the reason that isn't
> > happening is that the public and system IDs differ from the ones that
> > the resolver knows about. You're supposed to extend BootstrapResolver
> > (in your own application) if you need support for more than the
> > well-known public IDs and URIs for the catalog DTDs / schemas and set
> > an instance of this extension on the CatalogManager [2].
> Thank you Michael! After some more digging, I think the reason that the
> w3c-dtd-xhtml catalog.xml isn't using the well known catalog DTD public
> ID and URI,
> <!DOCTYPE catalog PUBLIC "-//OASIS//DTD XML Catalogs V1.0//EN"
>   "http://www.oasis-open.org/committees/entity/release/1.0/catalog.dtd">
> is that it's trying to use a different DTD?
> <!DOCTYPE catalog PUBLIC "-//GlobalTransCorp//DTD XML Catalogs V1.0-
> Based Extension V1.0//EN"
>     "http://globaltranscorp.org/oasis/catalog/xml/tr9401.dtd">
> The xml-core package distributes "tr9401.dtd", in addition to
> "catalog.dtd" - here it is,
> http://www.sfu.ca/~jdbates/tmp/debian/200910280/tr9401.dtd
> - and here are the differences between it, and the "catalog.dtd"
> included in resolver.jar,
> http://www.sfu.ca/~jdbates/tmp/debian/200910280/diff
> I dunno if the w3c-dtd-xhtml catalog.xml actually requires this
> different DTD, but it sounds like if it does, and the system ID isn't
> accessible, then it will only be parsable by tools which extend
> BootstrapResolver to add support for this different DTD?

That's what I would do. I could imagine extending BootstrapResolver so that
it uses a secondary catalog resolver so that you just update a catalog file
instead of the code when you need a redirect for yet another catalog DTD.


Michael Glavassevich
XML Parser Development
IBM Toronto Lab
E-mail: mrglavas@ca.ibm.com
E-mail: mrglavas@apache.org
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