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Alignment to om-lite
A. Alignment to om-lite OWL implementation of Observations and Measurements
This Annex describes the alignment of SOSA/SSN to the [OM-Lite] OWL2 implementation of OGC Observations and Measurements [OandM].
O&M was originally specified as a UML model, following the patterns specified in ISO 19109 Geographic Information - Rules for Application Schema [ISO-19109]. [OM-Lite] is a handcrafted implementation of O&M in idiomatic OWL.
The first section below describes a basic mapping between om-lite (OWL for Observations) and sam-lit (OWL for Sampling Features) and SOSA, comparable to the mapping to [OandM] described in the normative part of the specification. The subsequent two sections describe extensions to SOSA to match the semantics of the om-lite and sam-lite ontologies that were described in [OM-Lite]. These graphs demonstrate how om-lite and sam-lite could be re-built by extending SOSA both vertically (adding axioms to SOSA classes) and horizontally (adding new classes and properties, including sub-classes and properties of SOSA classes and properties).
A.1 Alignment to om-lite implementation of Observations and Measurements
The following namespace prefixes are used in the alignment to SOSA.
| Prefix | Namespace |
|---|---|
| sosa: | http://www.w3.org/ns/sosa/ |
| sosa-oml: | http://www.w3.org/ns/sosa/oml# |
| oml: | http://def.seegrid.csiro.au/ontology/om/om-lite# |
| samfl: | http://def.seegrid.csiro.au/ontology/om/sam-lite# |
Utility classes
Five utility classes are defined locally to support the formalization of the alignment.
1. Three disjoint subclasses of sosa:Procedure:
| sosa-oml:ActuationProcedure | Actuation procedures or recipes |
| sosa-oml:ObservationProcedure | Observation procedures or recipes |
| sosa-oml:SamplingProcedure | Sampling, sample preparation or processing procedures or recipes |
2. Two classes related to sampling, which complement SOSA classes related to actuation and observation:
| sosa-oml:SamplingDevice | Sampling, sample preparation or processing devices, comparable to sosa:Actuator and sosa:Sensor |
| sosa-oml:SamplingEvent | Sampling, sample preparation or processing event or act, comparable to sosa:Actuation and sosa:Observation |
Class alignments
The primary classes from [OM-Lite] have direct equivalents in SOSA classes supplemented by the utility classes described above, as follows:
| oml:Observation | equivalent class | sosa:Observation |
| oml:Process | equivalent class | sosa:Sensor or sosa-om:ObservationProcedure |
| samfl:SamplingFeature | equivalent class | sosa:Sample |
| samfl:Process | equivalent class | sosa-om:SamplingDevice or sosa-om:SamplingProcedure |
Property alignments
The following properties from [OM-Lite] have direct equivalents in SOSA properties:
| oml:featureOfInterest | equivalent property | sosa:hasFeatureOfInterest |
| oml:observedProperty | equivalent property | sosa:observedProperty |
| oml:phenomenonTime | equivalent property | sosa:phenomenonTime |
| samfl:sampledFeature | equivalent property | sosa:isSampleOf |
Additional alignments from [OM-Lite] properties to SOSA are as follows.
| oml:procedure | sub-property of | sosa:usedProcedure |
| samfl:samplingMethod | sub-property of | sosa:usedProcedure |
| oml:result | sub-property of | sosa:hasResult |
| oml:resultTime | sub-property of | sosa:resultTime |
| samfl:samplingTime | sub-property of | sosa:resultTime |
These are modeled as sub-properties because sosa:usedProcedure, sosa:hasResult and sosa:resultTime applies to actuation, observation or sampling activities.
| samfl:hostedProcedure | sub-property of | sosa:hosts |
This is modeled as a sub-property because the domain of iso19156-sfs:SF_SpatialSamplingFeature.hostedProcedure is a spatial sampling feature, such as a station, rather than a more general platform.
An RDF file containing a graph corresponding to this alignment is available.
A.2 Extension of SOSA to match om-lite
The RDF file oml-extension-of-sosa.ttl provides an extension of SOSA to match the full semantics of the observation ontology om-lite described in [OM-Lite]. Additional classes, properties and sub-classes and sub-properties of SOSA classes and proeprties are defined, as well as some restrictions on SOSA classes and properties, to achieve the same expressivity as om-lite. The namespace https://www.w3.org/ns/oml-on-sosa/ is used for new resources in this vertical extension to SOSA.
(more here if agreed)
A.3 Extension of SOSA to match sam-lite
The RDF file samfl-extension-of-sosa.ttl provides an extension of SOSA to match the full semantics of the sampling ontology sam-lite described in [OM-Lite]. Additional classes, properties and sub-classes and sub-properties of SOSA classes and proeprties are defined, as well as some restrictions on SOSA classes and properties, to achieve the same expressivity as sam-lite. The namespace https://www.w3.org/ns/sam-on-sosa/ is used for new resources in this vertical extension to SOSA.
(more here if agreed)
