vocabularies and datatypes for time intervals

[ghxiao]

Hi,

I saw some examples of RDF encodings of RDF streams. I am wondering if standardizing the vocabulary and datatypes is within the goal this WG.

:g1 {:axel :isIn :RedRoom. :darko :isIn :RedRoom} {:g1 :atInterval 2016-03-01T13:00:00Z/2016-03-01T13:00:10Z}
:g2 {:axel :isIn :BlueRoom. }                     {:g2 :atInterval 2016-03-01T13:00:20Z/2016-03-01T13:00:40Z}
:g3 {:minh :isIn :RedRoom. }                      {:g3 :atInterval 2016-03-01T13:00:50Z/2016-03-01T13:00:60Z}

For instance, based on the above example

• What is the prefix for :atInterval? Do we want to define other properties like ":startAt" or ":endAt"
• What is datatype for the literal 2016-03-01T13:00:00Z/2016-03-01T13:00:10Z?
• Do we want to introduce some built-in RDF functions to retrieve the start and end of an interval literal?