[DFDL-WG] ISO 8601 restricted profile and optional time zones

[Mike Beckerle]

Well, the definition of "I" can be whatever we want, but I suggest it
follow the iso 8601 format "as practiced" in the real world.

However, it can be strict or not about time zone, so long as there is some
other calendar pattern which would let us parse "almost iso" data that
lacks the timezone, fractional seconds, has one, or both of those.

But that can be entirely decoupled from what "I" pattern character means.

On Tue, Mar 5, 2013 at 5:56 AM, Steve Hanson <smh at uk.ibm.com> wrote:

> I'd like to discuss allowing time zone to be optional with the 'I'
> calendar pattern symbol. It looks like the ISO 8601 restricted profile
> insists that time zone appears if there are time components. See below.
>
> 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
> ----- Forwarded by Steve Hanson/UK/IBM on 05/03/2013 10:52 -----
>
> From:        Steve Hanson/UK/IBM
> To:        "Costello, Roger L." <costello at mitre.org>,
> Cc:        David Hardcastle/UK/IBM at IBMGB, "Cranford, Jonathan W." <
> jcranford at mitre.org>, "Garriss Jr., James P." <jgarriss at mitre.org>
> Date:        05/03/2013 10:51
> Subject:        Re: MBTK doesn't seem to support xsd:time correctly
> ------------------------------
>
>
> Roger,
>
> XML Schema spec talks about what is allowed in the value space of the XML
> Schema types, ie, what DFDL creates in its infoset.
>
> When parsing, DFDL uses a calendar pattern to identify what calendar
> components appear in the data, using dfdl:calendarPatternKind and
> dfdl:calendarPattern properties. If the pattern contains fractional seconds
> symbols ('SSS'), then at least one fractional second must appear in the
> data else it is an error.  If the pattern contains timezone symbols (eg,
> 'Z') then a time zone must appear in the data else it is an error.
>
> If you have data where the appearance of fractional seconds and/or time
> zone is optional, you might be able to use the calendar pattern 'I' symbol
> instead. This allows the data to match the time component of any of the
> 'granularities' in the ISO 8601 restricted profile (
> http://www.w3.org/TR/NOTE-datetime).  This will work if your data is of
> the form HH:mm[:ss[.SSS]][TZD].  Does your data match the ISO8601
> restricted profile?
>
> Testing the 'I' symbol this today I think there is a bug in MBTK where it
> only allows either no fractional seconds at all or exactly 3 fractional
> seconds (it should allow any number). I will raise a defect. Also,
> although MBTK allows time zone to be missing for 'I', I am not sure this is
> permitted by the restricted profile which seems to insist on time zone
> being present. I will raise this with the DFDL Working Group, as it seems
> to me that allowing time zone to be optional is useful.
>
> 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:        "Costello, Roger L." <costello at mitre.org>
> To:        David Hardcastle/UK/IBM at IBMGB, Steve Hanson/UK/IBM at IBMGB,
> Cc:        "Cranford, Jonathan W." <jcranford at mitre.org>, "Garriss Jr.,
> James P." <jgarriss at mitre.org>
> Date:        04/03/2013 18:24
> Subject:        MBTK doesn't seem to support xsd:time correctly
> ------------------------------
>
>
>
> Hello Steve and David,
>
> Here I declare a time element of type xsd:time:
>
> <xsd:element                  name="Time"
>                                  type="xsd:time"/>
>
> According to the XML Schema specification the xsd:time datatype can
> optionally specify fractional digits, e.g.:
>
>    11:30:30.333 +0500
>
> and timezone is optional:
>
>    11:30:30
>
> However, if I use fractional digits I get an error and if I omit timezone
> I get an error.
>
> I looked at the DFDL spec and I don't see any mention about not allowing
> fractional seconds or requiring timezone.
>
> Is this a bug in MBTK?
>
> /Roger
>
>
>
> 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
>
> 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
>
> --
>   dfdl-wg mailing list
>   dfdl-wg at ogf.org
>   https://www.ogf.org/mailman/listinfo/dfdl-wg
>



-- 
Mike Beckerle | OGF DFDL Workgroup Co-Chair | Tresys Technology |
www.tresys.com
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