[DFDL-WG] Action 192: URN scheme - was: Re: new action item needed: DFDL URN specification
Steve Hanson
smh at uk.ibm.com
Tue Nov 20 11:48:41 EST 2012
Agreed to defer introduction of URNs to DFDL vNext due to problems that
XML tools would experience if both allowed.
Regards
Steve Hanson
Architect, Data Format Description Language (DFDL)
Co-Chair, OGF DFDL Working Group
IBM SWG, Hursley, UK
smh at uk.ibm.com
tel:+44-1962-815848
From: Mike Beckerle <mbeckerle.dfdl at gmail.com>
To: Steve Hanson/UK/IBM at IBMGB,
Cc: Suman Kalia <kalia at ca.ibm.com>, dfdl-wg at ogf.org,
dfdl-wg-bounces at ogf.org
Date: 19/11/2012 21:33
Subject: Action 192: URN scheme - was: Re: [DFDL-WG] new action
item needed: DFDL URN specification
I'd like to add a sub-space for implementations to use for their
implementation-specific things. Nice thing about a URN is that it can
specify a structured scheme for this:
I suggest "imp" as a sub-specifier for implementation-specific URNs.
E.g., urn:ogf:dfdl:2011:imp:...
What goes after imp is an identifier of an implementation. E.g.,
urn:ogf:dfdl:2011:imp:opensource.ncsa.illinois.edu:...
urn:ogf:dfdl:2011:imp:ibm.com:...
and beneath that is anything that implementation needs/wants. E.g., a
namespace for extension properties that are non-standard, a version ID for
sub-versions of that implementation, etc. etc.
This allows an implementation to define extension properties, and have
other implementations give warnings that those are detected, but not
understood.
...mikeb
On Mon, Oct 29, 2012 at 11:37 AM, Steve Hanson <smh at uk.ibm.com> wrote:
Using the OGF's URN registration document [GFD.191] as a reference, I
suggest:
Type
URL
Proposed URN
common root
urn:ogf:dfdl
xmlns attribute
http://www.ogf.org/dfdl/dfdl-1.0/
urn:ogf:dfdl:2011
source attribute
http://www.ogf.org/dfdl/
urn:ogf:dfdl
[GFD.191] http://www.ogf.org/documents/GFD.191.pdf
Regards
Steve Hanson
Architect, Data Format Description Language (DFDL)
Co-Chair, OGF DFDL Working Group
IBM SWG, Hursley, UK
smh at uk.ibm.com
tel:+44-1962-815848
From: Suman Kalia <kalia at ca.ibm.com>
To: Mike Beckerle <mbeckerle.dfdl at gmail.com>,
Cc: dfdl-wg at ogf.org, dfdl-wg-bounces at ogf.org
Date: 25/10/2012 17:15
Subject: Re: [DFDL-WG] new action item needed: DFDL URN
specification
Sent by: dfdl-wg-bounces at ogf.org
I tend to agree that specifying urn for namespaces is better choice and
URL should be used for schema locations; however convention of
specifying URL for namespaces is long established some implementations use
the namespace URL to return the actual schema. When I try to access
the namespace URL for XML schema , it gives me reference to the document
but not schema..
Suman Kalia
IBM Canada Lab
WMB Toolkit Architect and Development Lead
Tel: 905-413-3923 T/L 313-3923
Email: kalia at ca.ibm.com
For info on Message broker
http://www.ibm.com/developerworks/websphere/zones/businessintegration/wmb.html
From: Mike Beckerle <mbeckerle.dfdl at gmail.com>
To: dfdl-wg at ogf.org,
Date: 10/25/2012 08:18 AM
Subject: Re: [DFDL-WG] new action item needed: DFDL URN
specification
Sent by: dfdl-wg-bounces at ogf.org
I wanted to add to this discussion the w3c blog page that highlights the
problem of the http-based naming scheme. There are many articles about
this, this is just one of them.
http://www.w3.org/blog/systeam/2008/02/08/w3c_s_excessive_dtd_traffic/
On Wed, Oct 24, 2012 at 10:35 AM, Mike Beckerle <mbeckerle.dfdl at gmail.com>
wrote:
Introduction:
Using URLs as identifiers has caused no end of problems. E.g., in DFDL we
have http://www.ogf.org/dfdl/dfdl-1.0/ as an identifier. W3C has
http://www.w3.org/2001/XMLSchema and others.
W3C has badly regretted establishing this convention, as they have farms
of servers that do nothing but quickly return 404 errors to save
network-aware applications the network-timeout delay that would otherwise
occur.
There are parties interested in exploiting DFDL who want DFDL schemas to
NOT contain network URLs because it simply creates a concern about network
access whenever a DFDL schema is inspected/used.
Pre-Proposal:
The new way to do this is with URNs which would look roughly like this:
urn:ogf:dfdl:standard:dfdl-1.0. The whole point is that some other
mechanism is used to establish correspondences between these and any
resources in file systems, networks, or built-in to implementations. One
such mechanism is called XML Catalog.
The point is that it is a name in a managed namespace which cannot be
confused with a network protocol URL.
OGF is already establishing urn:ogf, and an ogf subgroup has already
proposed urn:ogf:network for network resources. DFDL schemas aren't
network resources so we don't want to be a substructure underneath
network.
Some other mechanism is used to establish correspondences between these
and any resources in file systems, networks, or built-in to
implementations. One such mechanism is called XML Catalog.
Summary:
An action item should be to specify DFDL urn, submit to OGF as a proposed
namespace, and then produce errata/spec changes to specify its use.
This requires a small design activity to specify a scheme for the
sub-structure of the DFDL URNs (i.e., scheme for the stuff after
urn:ogf:dfdl:...) where we want standard identifiers for versions of the
standard, but we probably also want a few other things (e.g., I would like
a space for implementations to identify themselves, i.e., an
implementation-specific sub-area within our URNs.)
Our existing URLs can be compatible (deprecated) practice vs the preferred
URNs.
--
Mike Beckerle | OGF DFDL WG Co-Chair
Tel: 781-330-0412
--
Mike Beckerle | OGF DFDL WG Co-Chair
Tel: 781-330-0412
--
dfdl-wg mailing list
dfdl-wg at ogf.org
https://www.ogf.org/mailman/listinfo/dfdl-wg --
dfdl-wg mailing list
dfdl-wg at ogf.org
https://www.ogf.org/mailman/listinfo/dfdl-wg
Unless stated otherwise above:
IBM United Kingdom Limited - Registered in England and Wales with number
741598.
Registered office: PO Box 41, North Harbour, Portsmouth, Hampshire PO6 3AU
--
Mike Beckerle | OGF DFDL WG Co-Chair
Tel: 781-330-0412
Unless stated otherwise above:
IBM United Kingdom Limited - Registered in England and Wales with number
741598.
Registered office: PO Box 41, North Harbour, Portsmouth, Hampshire PO6 3AU
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.ogf.org/pipermail/dfdl-wg/attachments/20121120/6fc96904/attachment-0001.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: image/gif
Size: 48358 bytes
Desc: not available
URL: <http://www.ogf.org/pipermail/dfdl-wg/attachments/20121120/6fc96904/attachment-0001.gif>
More information about the dfdl-wg
mailing list