RDF-implementation.html

<h3>RDF implementation</h3>

<section id="namespaces">
    <h4>Namespaces</h4>

    <p style="text-align: center;">
        The namespace for the core terms is <span class="repeated"
            style="font-family: courier;">http://www.w3.org/ns/sosa/</span>
        <br>
        The suggested prefix for the SOSA namespace is <span class="repeated"
            style="font-family: courier;">sosa:</span>.
    </p>

    <aside class="note">
        <p>In previous editions of SSN, the namespace <span class="repeated"
                style="font-family: courier;">http://www.w3.org/ns/ssn/</span> was used for some terms.
            In this edition all core terms are consolidated into a single namespace.
            The terms in the `ssn:` namespaces remain in the RDF artefacts to protect backward
            compatibility of existing deployments, but are marked `deprecated`.
        </p>
    </aside>
</section>

<section id="dependencies">
    <h4>Dependencies</h4>
    <p>
        Each <a href="#modularization">module of the SSN Ontology</a> is packaged as an RDF file.
        The RDF representations use `owl:imports` statements to implement the dependencies.
        Within each graph, where further information (axioms and annotations) is added to an existing term,
        `rdfs:isDefinedBy` indicates the module where the term was originally defined.
    </p>
</section>

<section id="expressivity">
    <h4>Expressivity</h4>
    <p>
        The SOSA modules contain the basic definitions of the core terms.
        SOSA has axiomatization corresponding to the RDFS-Plus profile [[RDFS-Plus]] &mdash; `rdf:type`
        (`ClassAssertion`), and using axioms `ObjectInverseOf`, `SubClassOf` and `SubObjectPropertyOf`.
        SOSA includes the key annotations `rdfs:label` , `skos:definition` , `schema:domainIncludes`, and/or
        `schema:rangeIncludes`, plus other annotations as required.
        Inverses are named for all object properties.
    </p>
    <p class="note">
        RDFS-Plus is supported by major RDF implementations, such as
        <a href="https://graphdb.ontotext.com/documentation/11.1/reasoning.html#predefined-rulesets">GraphDB</a> and
        <a href="https://docs.cambridgesemantics.com/graphlakehouse/v3.2/userdoc/inferences.htm">AnzoGraph</a>.
    </p>
    <p>
        The SSN module is an OWL 2 DL ontology ([[[owl2-overview]]]) that contains the full axiomatization of the core
        terms, importing SOSA modules and using constructors such as `ObjectUnionOf`, `DisjointClasses`,
        `ObjectSomeValuesFrom`, and `ObjectAllValuesFrom`.
    </p>
    <p class="note">
        The generic property constraints `rdfs:domain` and `rdfs:range` are not used in the SSN Ontology.
    </p>
</section>

<section id="distribution">
    <h4>Distribution</h4>

    <section id="SOSAdistribution">
        <h5>SOSA</h5>

        <p style="text-align: center;">
            The SOSA graph contains the core definitions.
            <br>The ontology IRI of SOSA is <a href="http://www.w3.org/ns/sosa/">http://www.w3.org/ns/sosa/</a>.
            <br>The version IRI of SOSA 2023 edition is
            <a href="http://www.w3.org/ns/sosa/2023/">http://www.w3.org/ns/sosa/2023/</a>.
        </p>

        <p style="text-align: center;">
            SOSA Common is available at
            <a href="http://www.w3.org/ns/sosa/common/">http://www.w3.org/ns/sosa/common/</a>.
        </p>
        <p style="text-align: center;">
            SOSA Actuation is available at <a href="http://www.w3.org/ns/sosa/act/">http://www.w3.org/ns/sosa/act/</a>.
        </p>
        <p style="text-align: center;">
            SOSA Observation is available at
            <a href="http://www.w3.org/ns/sosa/obs/">http://www.w3.org/ns/sosa/obs/</a>.
        </p>
        <p style="text-align: center;">
            SOSA Sampling is available at <a href="http://www.w3.org/ns/sosa/sam/">http://www.w3.org/ns/sosa/sam/</a>.
        </p>
        <p style="text-align: center;">
            The complete SOSA is available at <a href="http://www.w3.org/ns/sosa/">http://www.w3.org/ns/sosa/</a>.
        </p>
    </section>

    <section id="SSNdistribution">
        <h5>SSN</h5>

        <p style="text-align: center;">
            The SSN graph contains the full axiomatization of the core terms.
            <br>The ontology IRI of SSN is <a href="http://www.w3.org/ns/ssn/">http://www.w3.org/ns/ssn/</a>.
            <br>The version IRI of SSN 2023 edition is
            <a href="http://www.w3.org/ns/ssn/2023/">http://www.w3.org/ns/ssn/2023/</a>.
        </p>

        <p style="text-align: center;">
            SSN Common is available at <a href="http://www.w3.org/ns/ssn/common/">http://www.w3.org/ns/ssn/common/</a>.
        </p>
        <p style="text-align: center;">
            SSN Actuation is available at <a href="http://www.w3.org/ns/ssn/act/">http://www.w3.org/ns/ssn/act/</a>.
        </p>
        <p style="text-align: center;">
            SSN Observation is available at <a href="http://www.w3.org/ns/ssn/obs/">http://www.w3.org/ns/ssn/obs/</a>.
        </p>
        <p style="text-align: center;">
            SSN Sampling is available at <a href="http://www.w3.org/ns/ssn/sam/">http://www.w3.org/ns/ssn/sam/</a>.
        </p>

        <p class="note">
            The RDF files of the 2017 edition remain available at their permanent version IRI, which is obtained by
            substituting <code>/sosa</code> with <code>/sosa/2017</code>, and <code>/ssn</code> with
            <code>/ssn/2017</code>.
            Similarly, the RDF files of the 2023 edition will remain available at their permanent version IRI, which is
            obtained by substituting <code>/sosa</code> with <code>/sosa/2023</code>, and <code>/ssn</code> with
            <code>/ssn/2023</code>.
        </p>
    </section>

</section>

<section id="index-of-classes-and-properties">
    <h4>Index of classes and properties</h4>
    <p>
        The following are alphabetical lists of the classes and properties in the SSN Ontology.
    </p>
    <p class="note">
        Terms added in the 2023 Edition are indicated with an asterisk*.
    </p>
    <div class="azlist">
        <p>
            <b>Classes:</b>
            <a>sosa:ActuatingProcedure</a>*,
            <a>sosa:Actuation</a>,
            <a>sosa:ActuationCollection</a>*,
            <a>sosa:Actuator</a>,
            <a>sosa:Asset</a>*,
            <a>sosa:Deployment</a>,
            <a>sosa:Execution</a>*,
            <a>sosa:ExecutionCollection</a>*,
            <a>sosa:FeatureOfInterest</a>,
            <a>sosa:MaterialSample</a>*,
            <a>sosa:Observation</a>,
            <a>sosa:ObservationCollection</a>*,
            <a>sosa:ObservingProcedure</a>*,
            <a>sosa:Platform</a>,
            <a>sosa:Procedure</a>,
            <a>sosa:Property</a>,
            <a>sosa:Sample</a>,
            <a>sosa:SampleCollection</a>*,
            <a>sosa:Sampler</a>,
            <a>sosa:Sampling</a>,
            <a>sosa:SamplingCollection</a>*,
            <a>sosa:SamplingProcedure</a>*,
            <a>sosa:Sensor</a>,
            <a>sosa:SpatialSample</a>*,
            <a>sosa:StatisticalSample</a>*,
            <a>sosa:Stimulus</a>,
            <a>sosa:System</a>
        </p>
    </div>
    <div class="azlist">
        <p>
            <b>Object Properties:</b>
            <a>sosa:actsOn</a>*,
            <a>sosa:actsOnProperty</a>,
            <a>sosa:deployedAsset</a>*,
            <a>sosa:deployedOnPlatform</a>,
            <a>sosa:deployedSystem</a>,
            <a>sosa:detects</a>,
            <a>sosa:featureHasUltimateSample</a>*,
            <a>sosa:forProperty</a>,
            <a>sosa:hasDeployment</a>,
            <a>sosa:hasFeatureOfInterest</a>,
            <a>sosa:hasInput</a>,
            <a>sosa:hasInputValue</a>*,
            <a>sosa:hasMember</a>*,
            <a>sosa:hasOriginalSample</a>*,
            <a>sosa:hasOutput</a>,
            <a>sosa:hasProcedure</a>*,
            <a>sosa:hasProperty</a>,
            <a>sosa:hasProxy</a>*,
            <a>sosa:hasResult</a>,
            <a>sosa:hasSample</a>,
            <a>sosa:isSampleOfUltimateFOI</a>*,
            <a>sosa:hasSubSystem</a>,
            <a>sosa:hasUltimateFeatureOfInterest</a>*,
            <a>sosa:hosts</a>,
            <a>sosa:implementedBy</a>,
            <a>sosa:implements</a>,
            <a>sosa:inDeployment</a>,
            <a>sosa:inputFor</a>*,
            <a>sosa:inputValueForExecution</a>*,
            <a>sosa:isActedOnBy</a>,
            <a>sosa:isDetectedBy</a>*,
            <a>sosa:isFeatureOfInterestOf</a>,
            <a>sosa:isHostedBy</a>,
            <a>sosa:isMemberOf</a>*,
            <a>sosa:isObservedBy</a>,
            <a>sosa:isOriginalSampleOf</a>*,
            <a>sosa:isProcedureFor</a>*,
            <a>sosa:isPropertyOf</a>,
            <a>sosa:isProxyFor</a>,
            <a>sosa:isResultOf</a>,
            <a>sosa:isResultOfMadeBySampler</a>*,
            <a>sosa:isResultOfUsedProcedure</a>*,
            <a>sosa:isSampleOf</a>,
            <a>sosa:isSubSystemOf</a>*,
            <a>sosa:isUltimateFeatureOfInterestOf</a>*,
            <a>sosa:madeActuation</a>,
            <a>sosa:madeByActuator</a>,
            <a>sosa:madeBySampler</a>,
            <a>sosa:madeBySensor</a>,
            <a>sosa:madeBySystem</a>,
            <a>sosa:madeExecution</a>,
            <a>sosa:madeObservation</a>,
            <a>sosa:madeSampling</a>,
            <a>sosa:madeSamplingHasResult</a>*,
            <a>sosa:observationRelatedTo</a>*,
            <a>sosa:observedProperty</a>,
            <a>sosa:observes</a>,
            <a>sosa:originated</a>*,
            <a>sosa:outputFor</a>*,
            <a>sosa:phenomenonOccurred</a>*,
            <a>sosa:phenomenonTime</a>,
            <a>sosa:propertyFor</a>*,
            <a>sosa:qualityOf</a>*,
            <a>sosa:relatedObservation</a>*,
            <a>sosa:resultQuality</a>*,
            <a>sosa:systemDeployment</a>*,
            <a>sosa:usedForExecution</a>*,
            <a>sosa:usedForExecutionHasResult</a>*,
            <a>sosa:usedProcedure</a>,
            <a>sosa:wasActedOnBy</a>*,
            <a>sosa:wasObservedBy</a>*,
            <a>sosa:wasOriginatedBy</a>
        </p>
    </div>
    <div class="azlist">
        <p>
            <b>Datatype Properties:</b>
            <a>sosa:endTime</a>*,
            <a>sosa:hasSimpleResult</a>,
            <a>sosa:resultTime</a>,
            <a>sosa:startTime</a>*
        </p>
    </div>

    <p>
        The SSN classes and properties are described in the following sections, organized by module as described in
        <a href="#modularization">Modularization</a>.
        A list of all SSN properties and their inverses with the classes that are included in their domains and ranges
        is
        provided in <a href="#Inverse-properties">Tabulation of properties and their inverses</a>.

    </p>

</section>