Re: AW: [xml] xmllint - what does the error message "work/xslt/export _ifc.xml:2 : error: Content error in the external subset" mean?

[Daniel Veillard <veillard redhat com>]

On Tue, Aug 26, 2003 at 06:34:29PM +0200, EXTERN Chakirov Timour (TZ CIS; DS/ESQ3) wrote:
> Hello and many thanks for your answer; with non-empty, eve dummy system id
> everithing is working.
>
> However it makes my life not easier, and now I have even more questions as
> formerly. All of these questions belongs to common practice of usage of xml
> and dtd, and maybe I have to ask them in other list, but I hope I could get
> an answer here.
>
> So, I'm starting from the very beginning.
>
> We have a dtd for some xml files. These xml-files will be used by several
> working groups. Dtd could not be obtained from inter- or intranet. We have
> no garanty that dtd-file could be found on the same place at every
> workstation (we're using at least 3 different OS, unix and windows-flavour).
> Because of that I have no idea what should I write as sytem identifier in
> DOCTYPE declaration.
>
> Our idea was what at every working place we set up a XML-catalog, with
> correctly defined resolution rules for PUBLIC identifier, something like
> this:
> ------------------------%<-----------------------------
> <?xml version="1.0"?>
> <!DOCTYPE catalog PUBLIC "-//OASIS//DTD Entity Resolution XML Catalog
> V1.0//EN"
> "http://www.oasis-open.org/committees/entity/release/1.0/catalog.dtd";>
> <catalog xmlns="urn:oasis:names:tc:entity:xmlns:xml:catalog">
> <group prefer="public" xml:base="file:///home/dt82fe/etc/xml/">
>  <public  
>      publicId="-//EDC//filelist 1.0//EN"
>      uri="edc/filelist/1.0/dtd/export_ifc.dtd"/>

also add one systemId for the canonical URL of that DTD.

> </group>
> </catalog>
> ------------------------%<-----------------------------
> and use such a catalog to obtain dtd for document validation.
>
> But this scenario does not work, because xmllint does not allow an empty
> systemID in doctype declaration.(actually I see no difference between empty,
> i.e. "" and any other dummy value like " " or
> "http://www.dummy.org/whatever.dtd";).

  Don't put a dummy URL, put the canonical one for that DTD.
Please read http://xmlsoft.org/guidelines.html which are guidelines I try
to get GNOME and other open-source projects to follow. It sounds to me
it answers most of your questions.
  Yes using XML catalogs is a good idea, no System ID should not be empty
because as I pointed out the semantic for this is clearly defined by 
RFC 2396 and definitely not what you want.

Daniel

-- 
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