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DATETIME  April 2011

DATETIME April 2011

Subject:

Re: BNF complexities

From:

Saašha Metsärantala <[log in to unmask]>

Reply-To:

Discussion of the Developing Date/Time Standards <[log in to unmask]>

Date:

Fri, 1 Apr 2011 11:55:07 +0200

Content-Type:

TEXT/PLAIN

Parts/Attachments:

Parts/Attachments

TEXT/PLAIN (95 lines)

Hello!

> > > BNF for the dateTime spec

> > > minute = zeroThru60

> > > second =  zeroThru60

> > Leap seconds occur but (as of today) not leap minutes. Therefore, I 
> > wonder why both are assigned zeroThru60.

> I don't think profiling out features in W3C schema is a good idea.
The XML Schema 1.0 recommendation and the XML Schema 1.1 working draft are 
different about this question. I was assuming that the expression "W3C XML 
Schema" in our specifications was refering to the rekommendation. I would 
therefore suggest to add a note on the web page
http://www.loc.gov/standards/datetime/spec.html making it clear which 
version of "W3C XML Schema" our specification refers to.

Here, I suggest some modifications in the BNF:

> oneThru12 = "01” | ”02” ...
There is a double vertical bar between ten and eleven.

> longYear = “y” "-"? positiveDigit “.e” yearExponent
This definition in the BNF excludes y170000000, which is an example given 
in # 330

> monthDay
This definition in the BNF excludes the 29th February on leap years.

> qualifier
Maybe we could add a note telling that this is not yet defined.

> duration
The number of parentheses in this part of the BNF is odd.

> startAndDuration
I would suggest the removal of this variable and just put its content in 
the definition of "interval".

------------------------------------------------ HOURS

> timeNoZone = timeNoFraction fraction?
timeNoZone = timeNoFraction fraction? | "24:00:00"

> hour = zeroThru24
hour = zeroThru23

> zone = "Z" | (+|-) hour “:” minute
zone = "Z" | (+|-) oneThru14 “:” minute

> oneThru24 = oneThru12 | "13” | ”14” | ”15” | ”16” [...] ”24"
oneThru14 = oneThru12 | "13” | ”14”

oneThru23 = oneThru14 | ”15” | ”16” | ”17” | ”18” | ”19” | ”20” | ”21” | 
”22” | ”23”

> zeroThru24 =  "00" | oneThru24
zeroThru23 =  "00" | oneThru23

> oneThru28 = oneThru24 | "25” | ”26” | ”27” | ”28” | ”29” | ”30”
oneThru28 = oneThru23 | "24” | "25” | ”26” | ”27” | ”28”

> oneThru30 = oneThru28 | ”29” | ”30”

oneThru29 = oneThru28 | "29”

oneThru30 = oneThru29 | "30”

------------------------------------------------ LISTS

> consecutives = listElement “..” listElement
consecutives = date “..” date

> listElements = listElement listElement (“,” listElement)*
listElements = listElement (“,” listElement)+
listContent = ( listElements | consecutives )

> inclusiveList =  “{“ listElements “}”
inclusiveList =  “{“ listContent “}”

> choiceList =  “[“ listElements “]” | “[“ earlier listElements? “]” | “[“ 
listElement? later “]”

choiceList =  “[“ ( listContent | ( earlier ( ", " listElement )* ) | ( ( 
listElement ", " )* later ) ) “]”

> listElement = date | consecutives
I suggest that this one is unchanged.

Regards!

Saašha,

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