Re: [calsify] Updated JSCalendar draft version 08

[Marten Gajda <[e-mail]>]

Am 08.10.2018 um 14:20 schrieb Robert Stepanek:
> The duration requirements for isAllDay are incomplete anyways: it can
> include day or week components. I'll update that.
>
> On P0D vs PT0S: I don't see a reason why a zero duration sub-field
> would signify anything but the absence of the according time unit, and
> vice versa. We do the same for the start LocalDate-property, which
> also is required to have a zero time component if isAllDay is true (as
> opposed to omitting the time fields). If we'd have gone with
> normalized durations, it might have made sense to require all zero
> duration fields to be omitted from the string representation, but the
> current spec doesn't require normalized durations.
>
> I do agree that the spec should be more clear on that zero duration
> components are equivalent to their absence, and I'll take note to
> update the Duration type description and isAllDay restrictions
> accordingly. Any objections to that?
No objections. If we're clear on what a "component" is and what it means
if it has a 0 coefficient vs. being absent I'm fine with it.

For me it would preferable to only allow a notation which contains no
"T" though. Allowing something like PT0H0M0S is just an additional
source for errors. People could come up the idea of specifying PT86400S
and argue that this equals 24 hours, "which is a day". After all, one of
the objectives of this new format is to "make it hard to get it wrong."

Having a format which is strict in cases like this makes it much easier
to argue about that.

>
> Note: in my opinion even P0W1D should be legit, but it's forbidden by
> the ABNF in iCalendar, so we might want to keep it at that.
>
> Cheers,
> Robert
>
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