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OpenGovLD / specs

Linked Data vocabulary and API for parliamentary and committee information systems
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xsd:dateTime versus dcterms:W3CDTF #109

Open akuckartz opened 9 years ago

akuckartz commented 9 years ago

Both are based on ISO 8601. How are they different? Which one is better? (Maybe both have their place in the specification?)

Popolo currently uses W3CDTF.

jpmckinney commented 9 years ago

I think you mean xsd:dateTime? xsd has different types for different date formats, e.g. you must use xsd:date if you omit the hours, minutes, seconds, xsd:gYear if you have only a year, and xsd:gYearMonth if you have a year and a month only.

dcterms:W3CDTF, on the other hand, is one type for all date expressions, whether it's 2014, 2014-01, 2014-01-01 or 2014-01-01T00:00:00Z. Popolo uses it because it's simpler to have one type.

http://www.w3.org/TR/xmlschema-2/ http://www.w3.org/TR/NOTE-datetime

akuckartz commented 9 years ago

Thanks, yes, I have corrected the subject.

And thanks a lot for answering my question. I am still having a look at the implications. I am not sure if that would be good, but I suppose that a more restricted xsd-datatype could be used as range for a subproperty of a property with range dcterms:W3CDTF. But that unfortunately would make matters significantly more difficult for the non-LD JSON world - which could be resolved by a different serialization for application/json.

akuckartz commented 9 years ago

Preliminary resolution: OpenGovLD will use dcterms:W3CDTF.