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= ISO 31-1 =

This is a page for the study of [http://en.wikipedia.org/wiki/ISO_31-1 ISO 31-1] which is the part of the international standard [http://en.wikipedia.org/wiki/ISO_31 ISO 31] format for durations and intervals as discussed on [http://microformats.org/discuss/mail/microformats-new/2008-August/001666.html microformats-new] also outlined on [[datetime-design-pattern#Individual_markup_of_each_date.2Ftime_component|datetime-design-pattern]].
* Wouldn't ISO-80000 be a better reference standard, given that ISO-31 has been obsoleted? [[User:TobyInk|TobyInk]] 00:33, 7 Aug 2008 (PDT)
* This proposal will eventually adopt ISO-80000-3, or the [http://en.wikipedia.org/wiki/International_System_of_Units#Future_development International System of Quantities] (ISQ) standard. [[User:WebOrganics|Martin McEvoy]] 14:48, 7 Aug 2008 (GMT)

==Contributors==

* [[User:WebOrganics|Martin McEvoy]]
* [[User:TobyInk|Toby Inkster]]

==Sample markup==

Proposed as a replacement or optimization of [[haudio#Duration|hAudio Duration]] expressed in ISO-31-1/ISQ format.

<pre>
<span class="duration">
 <span class="h">1</span>:
 <span class="min">3</span>:
 <span class="s">42</span>
</span> 
</pre>


===Issues===
* Raised By <cite>[http://microformats.org/discuss/mail/microformats-new/2008-August/001668.html Glenn Jones]</cite> on microformats new <blockquote>Having different datatypes for a property of the same name is very problematic. Personally I would not like us to use ISO-8601 for hCalendar duration and ISO-31-1 for duration in hAudio. Some parsers do try to convert formats into datatypes this could become hellish if we use the same property names for different data formats.</blockquote>
** Solution 1 — Change <code>duration</code> to <code>interval</code>. [[User:WebOrganics|Martin McEvoy]] 14:48, 7 Aug 2008 (GMT)
*** The problem with the name "interval" is that ISO-8601 (which microformats make use of!) defines a duration and an interval very differently. A duration is a length of time with no fixed starting or ending points — for example, "5 minutes". An interval is the span between two fixed times; a duration with fixed start and end points — for example, "five minutes starting now". I think we should avoid introducing a clash in terminology with ISO-8601.
*** Agreed [[User:WebOrganics|Martin McEvoy]] 12:11, 8 Aug 2008 (GMT)
** Solution 2 — Keep the name, and allow all properties which take a duration as their value (across all microformats!) to use this pattern. It can become a standard microformats design pattern. [[User:TobyInk|TobyInk]] 12:35, 7 Aug 2008 (PDT)

== Implementations ==

* The next released version of [http://buzzword.org.uk/cognition/ Cognition] will experimentally support four alternative syntaxes (syntaces?) for durations. They will be supported any place where a duration is expected. (e.g. hCalendar events, hAudio). As each syntax is quite different, you do not need to tell Cognition which syntax you will be using — this is detected automatically.
** ISO 8601: e.g. <code><nowiki><span class="duration">PT1H2M3.4S</span></nowiki></code>
** ISO 31-1 classes: As above.
** SI: <code><nowiki><span class="duration">52 s</span></nowiki></code>. (Seconds are the only supported unit.)
** [[measure|hmeasure draft]], with null "item" and with "type" set to "duration" or null. (Supported units: "seconds"/"s", "minutes"/"min", "hours"/"h", "days"/"d".)
*** When multiple hmeasures are found within the duration, the first ''valid'' duration hmeasure (i.e. a valid hmeasure which meets the above criteria) is used.

== See Also ==

* [[haudio|hAudio]] Proposal
* Wikipedia: [http://en.wikipedia.org/wiki/ISO_31-1 ISO 31-1]
* Wikipedia: [http://en.wikipedia.org/wiki/ISO/IEC_80000 ISO-8000]
* Wikipedia: [http://en.wikipedia.org/wiki/ISO-8601#Durations ISO-8601 Durations]
* [[measure]] draft schema
Return to ISO-31-1.
Retrieved from "http://mt.microformats.org/wiki/ISO-31-1"
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