Ready for OGC-NA Review: OGC API - Connected Systems - Part 1: Feature Resources

[ghobona]

OGC-NA,

The document(s) titled "OGC API - Connected Systems - Part 1: Feature Resources" is/are now available for review by the OGC Naming Authority (OGC-NA) Subcommittee.

https://docs.ogc.org/DRAFTS/23-001r0.html

Please review the documents by 22:00 UTC on May 3, 2024 focusing on its conformance to OGC-NA policies.

OGC-NA policies can be found at https://www.ogc.org/standards/na

The most relevant policies are:

• OGC-NA Name type specification - definitions (09-048r6)
• OGC-NA Name type specification - specification elements (10-103r1)

Let us know before then if there are any comments or objections to unanimous consent to its approval by the OGC-NA.

Regards,

OGC Staff

[ghobona]

Noting that the SensorML requirements class specifies a media type of application/sml+json.

Since the media type is not yet registered with IANA, I think this should be in the vendor (vnd.) tree instead.

[ghobona]

The document currently uses the following term.

UAS: Unmanned Aerial System

ISO 5305 defines UAS as unmanned aircraft system, see https://www.iso.org/obp/ui/en/#iso:std:iso:5305:ed-1:v1:en

ISO 23665, ISO 21384, and ISO 4358 also use the term ‘unmanned aircraft system’.

The UxS DWG uses the term Uninhabited System.

https://www.ogc.org/about-ogc/committees/dwg/uninhabited-systems-domain-working-group/

[ghobona]

Some URIs appear to have placeholders (e.g. TBD) in them.

See Tables 6, 10, and 15.

See also the Example underneath Table 21

[dr-shorthair]

Alex -

I noticed an inconsistency on the definition of one of the Sampling Feature Associations in Table 17

sampledFeature sosa:isSampleOf he ultimate feature of interest that is being sampled or controlled. In OMS and SSN, the relation isSampleOf​ links a Sample to the proximate​ feature of interest, not the ultimate FoI. There may then be a chain of further samples before you reach the ultimate FoI. The additional properties hasOriginalSample​ and hasSampledFeature​ provide shortcuts. See diagrams in the SSN-Ext paper, which inspired OMS and the SSN update - https://www.w3.org/TR/vocab-ssn-ext/#ultimate-feature-of-interest

Perhaps we should add these diagrams and explanation into the SSN update, in the Common Modeling Questions section?

[ghobona]

@alexrobin Please see the comments above.

[alexrobin]

@gobona I'm glad you created this issue since we wanted to seek advice from the OGC NA on these topics.

Regarding media types, is there a need/good reason to register them with IANA ultimately, or are we happy with something in vnd.ogc namespace for the entire life of the standard? I don't mind either way. Less work is good ;-) Is the vnd.ogc namespace registered officially?

Regarding our custom URIs, is the recommendation to host these in the OGC definition server? If so,what's the process to do that these days?

[dr-shorthair]

Hi Kathi,

No, the definitions haven't diverged. This just means that all the platforms that are under a System collection are both sosa:Platform and sosa:System as per the discussion we had in the SOSA/SSN WG.

See my comment here: https://github.com/opengeospatial/ogcapi-connected-systems/issues/52

Thanks,

--

Alex Robin

Chief Technology Officer | GeoRobotix Inc. | +1 302 703 7072

On Wed, May 1, 2024 at 12:52 PM Kathi Schleidt @.***> wrote:

Hi Alex,

an additional inconsistency with SOSA that I've noticed - in Table 5 you list SOSA:Platform under the connected-systems:System Types. Does this imply that your definitions of System and Platform have diverged from the base SOSA definition?

:?

Kathi System Type URI CURIE Usage Sensor http://www.w3.org/ns/sosa/Sensor sosa:Sensor When the system’s primary activity is ‘sensing’ or ‘observing’. Actuator http://www.w3.org/ns/sosa/Actuator sosa:Actuator When the system’s primary activity is ‘actuating’. Sampler http://www.w3.org/ns/sosa/Sampler sosa:Sampler When the system’s primary activity is ‘sampling’. Platform http://www.w3.org/ns/sosa/Platform sosa:Platform When the system’s primary activity is ‘carrying’ other systems. System http://www.w3.org/ns/ssn/System ssn:System For all other system types.

[ghobona]

@alexrobin Ultimately, the goal is to register application/sml+json with IANA. However, it may take a while, therefore a note similar to the JSON-FG one would is ideal.

So by all means, please keep application/sml+json. However, include a note that allows for the vnd type as well until the registration is completed.