[DFDL-WG] Action 206 - proposed timezone-from-dateTime function

[Mike Beckerle]

I examined use of ISO durations, but that introduces a bunch of unnecessary
complexity for implementors. I decided to propose instead use of an ISO
8601Time zone designator as an xs:string.

Proposed:

dfdl:timeZoneFromDateTime($arg as xs:dateTime?) as xs:string?

Summary: Returns the timezone component of $arg if any. If $arg has a
timezone component, then the result is a string in the format of an ISO
Time zone designator. Interpreted as an offset from UTC, its value may
range from +14:00 to -14:00 hours, both inclusive. UTC is represented as
"Z".

If the $arg has no timezone component, then the value of the
dfdl:calendarTimeZone property expressed as an ISO 8601 Time zone
designator is returned, or ""(empty string) is returned if the
dfdl:calendarTimeZone property is ""(empty string).

 Examples

   -

   dfdl:timeZoneFromDateTime(xs:dateTime("1999-05-31T13:20:00-05:00"))returns
the
   xs:string value "-05:00".
   -

   dfdl:timeZoneFromDateTime(xs:dateTime("2000-06-12T13:20:00Z")) returns
   the xs:string value "Z".
   -

   dfdl:timeZoneFromDateTime(xs:dateTime("2004-08-27T00:00:00")) with
   dfdl:calendarTimeZone='America/New_York' returns the xs:string "-05:00".



---------- Forwarded message ----------
From: Mike Beckerle <mbeckerle.dfdl at gmail.com>
Date: Tue, Jan 29, 2013 at 9:05 AM
Subject: Re: clarification needed: datetime and time
To: dfdl-wg at ogf.org


I also believe this means we are missing this function:

fn:timezone-from-dateTime($arg as xs:dateTime?) as xs:dayTimeDuration?

However, we don't have this result type dayTimeDuration, so rather than add
that type, which is a structured thing like: PnDTnHnMnS, we should say it
matches the iso 8601 time zone suffix on an iso datetime.
So "Z" or "-05:00" etc.

Since it is not exactly the existing Xpath function, perhaps this function
should not have this name or not be in the fn namespace. Come to think of
it. I don't think we ever say exactly what the fn: prefix is bound to in
DFDL.



On Tue, Jan 29, 2013 at 8:55 AM, Mike Beckerle <mbeckerle.dfdl at gmail.com>wrote:

> In the below. Should xs:datetime have trailing timezone as well? Right now
> it has no tz component.
>
> Seems to me it should to match iso 8601 format which is what XSD uses.
>
> Also, I believe we now think ZZZ is not the right behavior, and seems to
> be deprecated in ICU. The right thing is ZZZZZ.
>
>    calendarPatternKind
>
> Enum
>
> Valid values ‘explicit’, ‘implicit’
>
> ‘explicit’ means the pattern is given by dfdl:calendarPattern,
>
> ‘implicit’ means the pattern is derived from the XML schema date/time type.
>
> *Logical Type *
>
> *Default Pattern*
>
> xs:date
>
> yyyy-MM-dd
>
> xs:dateTime
>
> yyyy-MM-dd'T'HH:mm:ss
>
> xs:time
>
> HH:mm:ssZZZ
>
> Annotation: dfdl:element, dfdl:simpleType
>
>
> --
> Mike Beckerle | OGF DFDL Workgroup Co-Chair | Tresys Technology |
> www.tresys.com
>
>


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




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