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Re: [sdw] Homogeneity of an ObservationCollection

From: Simon Cox via GitHub <sysbot+gh@w3.org>
Date: Mon, 30 Apr 2018 08:51:47 +0000
To: public-sdwig@w3.org
Message-ID: <issue_comment.created-385342825-1525078306-sysbot+gh@w3.org>
@kjano noted that the proposal has a cardinality constraint that there will be no more than one of the characteristic properties* on an `ObservationCollection`, and asked what that means for a collection in which the members are inhomogeneous on one or more of these axes. 

The intention is that a value for one of these characteristic properties would be given at the collection level **iff** the members share a single value for the property. For any property that is _not_ homogeneous in the collection, the value should be given to each individual member and not to the collection. The `ObservationCollection` can make discovery easier and encoding more compact with respect to homogeneously-valued properties. It is not intended to enumerate **all** the values of all the characteristic properties of all the member observations. 

*
feature-of-interest
ultimate feature-of-interest
observed-property
procedure
sensor
phenomenon-time
result-time



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