[DFDL-WG] Action 192: URN scheme - was: Re: new action item needed: DFDL URN specification
Mike Beckerle
mbeckerle.dfdl at gmail.com
Mon Nov 19 16:33:31 EST 2012
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* <http://www.ogf.org/dfdl/>
> IBM SWG, Hursley, UK*
> **smh at uk.ibm.com* <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
> *<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/*<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
> * <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/*<http://www.ogf.org/dfdl/dfdl-1.0/>as an identifier. W3C has
> *http://www.w3.org/2001/XMLSchema* <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* <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*<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
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.ogf.org/pipermail/dfdl-wg/attachments/20121119/d921ee52/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/20121119/d921ee52/attachment-0001.gif>
More information about the dfdl-wg
mailing list