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Re: [sdw] Homogeneity of an ObservationCollection

From: Sergio José Rodríguez Méndez via GitHub <sysbot+gh@w3.org>
Date: Thu, 26 Apr 2018 20:50:51 +0000
To: public-sdwig@w3.org
Message-ID: <issue_comment.created-384784832-1524775850-sysbot+gh@w3.org>
Hi.

As mentioned [previously](https://github.com/w3c/sdw/commit/cc6824f448a91402b607b93ba4c0ec276e54d014#commitcomment-28727415), and to follow this discussion about "Homogeneity" for several observations, below are some comments from the BCI community:

Following @kjano opinion about that a collection may group observations with different FOI and/or taken by different sensors, this is exactly the case in [Brain Computer Interaction (BCI)](https://w3id.org/BCI-ontology#) applications, where in a single "[Session](https://w3id.org/BCI-ontology#Session)" a person (or "[Subject](https://w3id.org/BCI-ontology#Subject)") is being monitored ("[Record](https://w3id.org/BCI-ontology#Record)", aligned to _sosa:Observation_) by (possibly) several devices ("[Device](https://w3id.org/BCI-ontology#Device)", aligned to _sosa:Sensor_) for different biomedical modalities ("[Modality](https://w3id.org/BCI-ontology#Modality)", aligned to _sosa:ObservableProperty_).

For BCI, it's common that in a single "Session" researchers handle information for several _sosa:Observation_ (and _sosa:Actuation_). Specifically for observations, BCI applications may monitor several "modalities" (EEG, ECG, motion capture, etc.) through different sensors for different FOI, all during one session.

Therefore, in some cases, some BCI sessions could be "[ObservationCollection](https://w3c.github.io/sdw/proposals/ssn-extensions/#sosa:ObservationCollection)" but not all BCI sessions are "ObservationCollection".

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