[oXygen-user] Working with Catalogs
Eliot Kimber
Fri Sep 30 10:33:34 CDT 2005
I'm trying to set up some new catalogs for DITA (I'm tasked with
defining how DITA will use various forms of URL and public ID to handle
version-specific and inspecific references).
I'm trying to use oXygen 6.2 to develop and test my catalogs and I'm not
having much luck, which is probably mostly user error but I think there
may be some limitations in oXygen's catalog implementation and I'm
trying to figure out which is which. Unfortunately, the online help for
catalogs is not helpful in this case.
I'm trying to do several things:
1. Set up entries that map namespace URIs to local URLs for the
corresponding schema document
2. Set up entries that map one URL to another URL.
3. Set up entries that map public IDs to system IDs that are
fully-qualified URLs that then map, via URI entries, to local files
I'm running into several problems. In all cases, I have set the catalog
options to not use the default catalogs and I only list one top-level
catalog, which then uses <next-catalog> elements to point to subordinate
catalogs that do the actual mapping, i.e.:
<catalog>
<nextCatalog catalog="dtd/catalog-dita-dtd.xml" />
</catalog>
--------------------------------------------
Problem 1: HTTP URL not resolved via catalog
I have a document with this DOCTYPE declaration:
<!DOCTYPE topic SYSTEM
"http://dita.oasis-open.org/DITA/version.1.0/topic.dtd">
In my catalog I have this entry:
<uri name="http://dita.oasis-open.org/DITA/version.1.0/topic.dtd"
uri="topic.dtd"/>
I have verified that the file "topic.dtd" is where the catalog says it
is (using "edit file at cursor within oXygen).
When I validate the document, I get this error:
"Description: F HttpException-dita.oasis-open.org
(http://dita.oasis-open.org/DITA/version.1.0/topic.dtd)"
This suggests that the validator is trying to resolve the URL and, upon
failure to do so (the URL isn't currently resolvable), is not then
trying to resolve it via the catalog, which it should be doing.
Also, in this case, even if the URL was resolvable over the net, I would
prefer to have it resolved via the catalog--I didn't see an option for
controlling that behavior.
-----------------------------------------------------
Problem 2: Non-HTTP URN gives malformed URL exception
In another document I have this doctype declaration:
<!DOCTYPE topic SYSTEM
"urn:oasis:http://dita.oasis-open.org/DITA/topic.dtd">
When I try to validate I get this failure:
"Description: F MalformedURLException-unknown protocol: urn"
This suggests that oXygen is expecting the SYSTEM value to be an HTTP
URL, which is not required by the XML spec (the SYSTEM value is a URI,
not a URL).
In this case, I would expect the validator to try to resolve the URN via
the catalog (where it is mapped) and only if that fails then return
"could not resolve URN" error, not a malformed URN exception.
------------------------------------------------------
Problem 3: Unclear response from catalog verbose trace
It's also not clear what these catalog trace messages are telling me:
Description: Public: null System:
http://dita.oasis-open.org/DITA/version.1.0/topic.dtd = null
In particular, what the final "null" is indicating--does that indicate
that the file to which the URI is mapped couldn't be found? I couldn't
find an explanation of this case in the online docs.
Cheers,
Eliot
--
W. Eliot Kimber
Professional Services
Innodata Isogen
9390 Research Blvd, #410
Austin, TX 78759
(512) 372-8841
www.innodata-isogen.com
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