ISSUE-33: Collections of observations and well-formedness of slices

Slices

Collections of observations and well-formedness of slices

State:

CLOSED

Product:

Data Cube Vocabulary

Raised by:

Dave Reynolds

Opened on:

2012-02-17

Description:

The qb:Slice structure is used to collect all qb:Observations that have a given fixed set of values for a subset of the cube's dimensions. This is used to support abbreviated format and to indicate to data consumers how best to present the cube. For example, many statistical datasets are organized as time series so that the slices fix every dimension except time.

Thus implicitly for a given qb:SliceKey there is a disjoint cover of qb:Slices (every observation is in one and only one slice with that key).

In practice we have observed a number groups using, or suggesting use slices as a way to group more arbitrary subsets of the observations. Specific uses cases include collecting all the "latest" observations in a continuously updated data set (bathing water quality use case), or collecting all observations for a particular subset of time or space for efficiency of access (air quality use case).

(1) Is it legitimate to use qb:Slice without a well defined qb:SliceKey for these more arbitrary collections of observations?

(2) If not should Data Cube include a qb:Collection mechanism to support such use cases?

(3) Should the domain constraint on qb:observation (currently rdfs:domain qb:Slice) be lifted to it to be used for such collections.

Related Actions Items:

No related actions

Related emails:

1. Re: AW: [QB] Disposition of issues (from dave.e.reynolds@gmail.com on 2013-03-07)
2. Re: AW: [QB] Disposition of issues (from dave.e.reynolds@gmail.com on 2013-03-07)
3. AW: [QB] Disposition of issues (from kaempgen@fzi.de on 2013-03-07)
4. [QB] Disposition of issues (from dave.e.reynolds@gmail.com on 2013-03-05)
5. Re: [QB] ISSUE-33 Discussion and possible resolutions (from richard@cyganiak.de on 2013-03-03)
6. Re: [QB] ISSUE-33 Discussion and possible resolutions (from dave.e.reynolds@gmail.com on 2013-03-02)
7. Re: [QB] ISSUE-33 Discussion and possible resolutions (from richard@cyganiak.de on 2013-03-02)
8. AW: AW: [QB] ISSUE-33 Discussion and possible resolutions (from kaempgen@fzi.de on 2013-03-01)
9. Re: AW: [QB] ISSUE-33 Discussion and possible resolutions (from dave.e.reynolds@gmail.com on 2013-02-28)
10. AW: [QB] ISSUE-33 Discussion and possible resolutions (from kaempgen@fzi.de on 2013-02-28)
11. [QB] ISSUE-33 Discussion and possible resolutions (from dave.e.reynolds@gmail.com on 2013-02-27)
12. RE: Data Cube issues (from kaempgen@fzi.de on 2012-03-22)
13. Re: Data Cube issues (from dave.e.reynolds@gmail.com on 2012-03-22)
14. RE: Data Cube issues (from kaempgen@fzi.de on 2012-03-21)
15. RE: Data Cube issues (from kaempgen@fzi.de on 2012-03-21)
16. ISSUE-33: Collections of observations and well-formedness of slices (from kaempgen@fzi.de on 2012-03-21)
17. RE: ISSUE-34 (Subslices): Clarify or drop qb:subslice ? [Data Cube Vocabulary] (from kaempgen@fzi.de on 2012-02-20)
18. ISSUE-34 (Subslices): Clarify or drop qb:subslice ? [Data Cube Vocabulary] (from sysbot+tracker@w3.org on 2012-02-17)
19. ISSUE-33 (Slices): Collections of observations and well-formedness of slices [Data Cube Vocabulary] (from sysbot+tracker@w3.org on 2012-02-17)

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