Change frequency estimate

[GoogleCodeExporter]

I'm working on caching semweb resources now, and since HTTP allows calculation 
of heuristic freshness, see http://tools.ietf.org/html/rfc7234#section-4.2.2 it 
would be interesting to have properties that could be used for this. We have 
dct:issued and dct:modified of course, and the combination of those and a 
void:changeFrequency could be used for calculating heuristic freshness.

Original issue reported on code.google.com by kjet...@gmail.com on 27 Nov 2014 at 12:25

[GoogleCodeExporter]

Now, my paper on this topic has been accepted to ESWC 2015 Research Track:
http://folk.uio.no/kjekje/#cache-survey

That there should be a change frequency predicate are amongst the 
recommendations I make in there. :-)

Looking into the datatypes, I think that it might be most appropriate to use a 
duration datatype, e.g. the XPath 2.0 datatypes xs:yearMonthDuration and 
xs:dayTimeDuration.

Original comment by kjet...@gmail.com on 13 Apr 2015 at 8:31

[GoogleCodeExporter]

Uh, forgot the link: http://www.w3.org/TR/xpath-functions/#duration-subtypes

Original comment by kjet...@gmail.com on 13 Apr 2015 at 8:32

[VladimirAlexiev]

dct:accrualPeriodicity is often used but the value is an object such as freq:biweekly. I wonder what can be the values of void:changeFrequency ?

[cygri]

@VladimirAlexiev: void:changeFrequency is a proposal made by Kjetil Kjernsmo above. It is not part of current VoID. Kjetil proposes use of typed literals with xs:yearMonthDuration and xs:dayTimeDuration as values of the property.