Point and period of date-time

[csarven]

Request: A generic way to indicate point (e.g., instant) and period (e.g., intervals, reference, calendar) of date-time. AFAICT, these fall outside of the current use date-time start/end* or *published/modified etc. Point and period should be separate properties (in contrast to dcterms:date for example).

[csarven]

This addition will be particularly useful in order to declare temporal dimensions in statistical data. I suspect that there will need to be some usage in any case with https://github.com/w3c/csvw

[csarven]

What already exists:

• http://reference.data.gov.uk/id/{gregorian-interval, gregorian-instant, year, month, day, hour, quarter}
• http://reference.data.gov.uk/def/intervals
• http://www.w3.org/2006/time
• ...

[csarven]

An example of a point in time is when an event takes place on a given day without specifying the time. It is possible to infer this if both startDate and endDate have the same value, however, I think a single property e.g., schema:date would be simpler i.e., an equivalent to dcterms:date.

[mfhepp]

If you implement that, I recommend to use the same pattern as in value/minValue/maxValue and price/minPrice/maxPrice, i.e. to make

schema:date rdfs:subPropertyOf schema:startDate and schema:endDate.

By that, a one-day event will also have the proper startDate and endDate values.

Note that the respective axioms (from GoodRelations) are currently missing in schema.org because I forgot to submit the pull-request, but they will come asap.

---

martin hepp http://www.heppnetz.de
mhepp@computer.org @mfhepp

On 23 Sep 2015, at 14:35, Sarven Capadisli notifications@github.com wrote:

An example of a point in time is when an event takes place on a given day without specifying the time. It is possible to infer this if both startDate and endDate have the same value, however, I think a single property e.g., schema:date would be simpler e.g., an equivalent to dcterms:date.

—
Reply to this email directly or view it on GitHub.

[github-actions]

This issue is being tagged as Stale due to inactivity.

[VladimirAlexiev]

@csarven @mfhepp

1. I raised a similar issue in Proposal for representing Aggregate Statistical Data #2291: observationDate vs reference period
2. https://schema.org/PropertyValue has value, minValue, maxValue. Doesn't this fulfill your need?