What is an Object Information Model (OIM)?

The Ontology for OIMs is in fact the Ontology for Reference Class Ontologies. It adds to the Taxonomy of Reference Data (RDL) the interrelations between the classes defined in that RDL.

An Object Information Model (OIM) represents the kinds of lifecycle information of the members of an OWL Class. That Class shall play a role in the template class, i.e. shall be the (rdf:)object of at least one of the (rdf:)Properties of that template.

NOTE    That OWL Class is meant to be any owl:Class representing a Part 2 entity data type, a part 4 subClassOf it, or a user-defined subClassOf it.

The reason why we call it Object Information Model and not the commonly used term Product Information Model is that we can also define them for the Activity Class and all the subclasses thereof.

OIMs are the result of consultations and consensus between domain experts. Since such consultations will be an ongoing activity, the OWL ontology for object information models will grow over time.

Mapping data in any system to the format defined in this part of ISO 15926 can be done upfront and is a deterministic activity, in case the applicable specialized template is already listed in the applicable OIM. If not yet, the user can add that specialized template to that OIM for the short term, and propose a normative addition to that OIM for the long term.

In principle an OIM is all-inclusive and infinitely large, in practice its contents will be determined by business needs.  

All OIMs are listed in the normative OWL Ontology for Object Information Models. The normative version of the listing of this schema will be available from the Internet.

The OWL Ontology for Templates and the Ontology for Reference Data are imported in the OWL Ontology for Object Information Models. This means that all known generic classes and templates are available as if they were defined in this OIM ontology.

The OIM for an object does not include the OIM for its components. These shall be defined separately.

Example of an OIM

Figure 1 - OIM (partial) of a centrifugal pump

Part of the OIM of a centrifugal pump can also be shown as follows:

Figure 2 - Specialization of Classes and their OIMs

Templates are n-ary relationships between two or more objects. These objects are referenced by means of rdf:Properties.

Those objects that we wish to maintain an OIM for must get a set of inverse Properties. These inverse Properties are dynamically collected by the software and presented as the OIM at that time.

For example: the instances of PUMP in Figure 2 participate in instances of template class ST-PUMP-3153-012 as 'whole'. The inverse Property of this is shown as 'isWholeIn':

    <owl:ObjectProperty rdf:ID="isWholeIn">

        <owl:inverseOf rdf:resource="#whole"/>

    </owl:ObjectProperty>

These inverse properties are the placeholder of cardinalities. The three examples shown in Figure 2 define that:

• a particular instance of the class PUMP can be involved in 0-1 instances of template class &oim:ST-PUMP-3401-023;
• a particular instance of the class PUMP can be involved in 2-6 instances of template class &oim:ST-PUMP-3153-012;
• a particular instance of the class CENTRIFUGAL PUMP can be involved in 2-3 instances of template class &oim:ST-CENTRIFUGAL_PUMP-3153-012;

Specialization

As can be seen in Figure 2 the CENTRIFUGAL PUMP Class is a subClassOf PUMP Class. It inherits the Properties of that PUMP Class. So the CentrifugalPump Class inherits the isPossessorIn and isWholeIn Properties from the PUMP Class (obviously there are many more!). Via the template class ST-PUMP-3401-023 it can be inferred that it has a NOMINAL VOLUME CAPACITY. The situation with the number of bearings is such that via inheritance from PUMP we know that there are 2 - 6 bearings, but in this case we have also specialized the template to indicate that for CENTRIFUGAL PUMP the number of bearings is further constrained to 2 - 3.

Ontology

The Ontology for Object Information Models imports the Ontology for Data Model and Taxonomy for Reference Data that defines the Class hierarchy. It adds to that the specialized templates in which these imported Classes participate.

In cases where an organization needs an extension of the above ontologies (click on the ovals to find more information) :

Figure 3 - Private extensions of ontologies

As stated before, the pick list of an OIM is dynamically put together by software. These pick lists are used to configure a Document Type.

Example

Electric motor

ELECTRIC MOTOR is an instance of ClassOfInanimatePhysicalObject that has templates for the following information:

allowable starting voltage percentage

breakdown torque

cold locked rotor time

hot locked rotor time

locked rotor torque

number of allowable consecutive cold starts

number of allowable consecutive hot starts

power factor at 1/1 load

power factor at 3/4 load

rated current

rated output power

rated torque

rated voltage

starting current at 0.8 un

starting current at 1.0 un

starting power factor

time constant at nominal voltage

upper limit starting current multiplier

Induction motor

INDUCTION MOTOR is a ClassOfInanimatePhysicalObject that is a subClassOf above class ELECTRIC MOTOR, and it adds templates for the information below to those applicable for that ELECTRIC MOTOR class:

allowable starting voltage drop factor

asynchronous speed

asynchronous speed at 1/1 load

breakdown torque multiplier

efficiency

inertia

locked rotor torque multiplier

lower limit rated efficiency at 1/1 load

lower limit rated output at duty type s1

lower limit rated speed at 1/1 load

lower limit rated torque

lower limit starting time

number of starts per hour

percentage

power factor

power factor at 1/2 load

rated efficiency

rated efficiency at 1/1 load

rated efficiency at 1/2 load

rated efficiency at 3/4 load

rated frequency

rated output at duty type s1

rated output shaft power

rated power

rated rotational speed

rated speed at 1/1 load

ratio

rotational inertia

rotational inertia at rated speed

sound pressure level at nominal load

sound pressure level, sinus load

speed/torque curve

standard rated current

starting current

starting current multiplier

starting time at 80% voltage

starting time at 80% voltage with driven equipment

starting time at nominal voltage

starting time at nominal voltage with driven equipment

temperature rise

temperature rise, windings

thermal time constant eexe motor

time constant at 0.8 nominal voltage

time constant multiplier

upper limit breakdown torque multiplier

upper limit locked rotor torque multiplier

upper limit number of starts per hour

upper limit permissible starting current

upper limit sound power level at nominal load

upper limit temperature rise

upper limit time constant multiplier

vibration detection method

voltage change factor

Listing

Below a example code listing for the first three Properties of the ELECTRIC MOTOR class is given:

<rdf:RDF

    xml:base="http://oim.rdlfacade.org/data"

    xmlns="http://oim.rdlfacade.org/data#"

    xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"

    xmlns:xsd="http://www.w3.org/2001/XMLSchema#"

    xmlns:rdfs="http://www.w3.org/2000/01/rdf-schema#"

    xmlns:owl="http://www.w3.org/2002/07/owl#"

    xmlns:part2="http://dm.rdlfacade.org/data#"

    xmlns:part4="http://rdl.rdlfacade.org/data#"

    xmlns:part7="http://tpl.rdlfacade.org/data#">

    <owl:Ontology rdf:about="">

        <rdfs:comment xml:lang="en">Ontology for Object Information Models (partly), according ISO 15926-7 and in OWL</rdfs:comment>

        <rdfs:label xml:lang="en">Ontology for OIMs (partly)</rdfs:label>

        <owl:imports rdf:resource="http://dm.rdlfacade.org/data"/>

        <owl:imports rdf:resource="http://rdl.rdlfacade.org/data"/>

        <owl:imports rdf:resource="http://tpl.rdlfacade.org/data"/>

        <owl:versionInfo>March 2008</owl:versionInfo>  

    </owl:Ontology>

    <owl:ObjectProperty rdf:ID="isPossessorIn">

        <owl:inverseOf rdf:resource="http://tpl.rdlfacade.org/data#possessor"/>

    </owl:ObjectProperty>

    <part2:ClassOfInanimatePhysicalObject rdf:about="http://rdl.rdlfacade.org/data#RDS415124">

        <rdfs:subClassOf>

            <owl:Restriction>

                <owl:onProperty rdf:resource="#isPossessorIn"/>

                <owl:allValuesFrom rdf:resource="#ST-ELECTRIC_MOTOR-3401-025" />

                <owl:maxCardinality rdf:datatype="http://www.w3.org/2001/XMLSchema#nonNegativeInteger">1</owl:maxCardinality>

           </owl:Restriction>

        </rdfs:subClassOf>

    </part2:ClassOfInanimatePhysicalObject>

    <part2:ClassOfInanimatePhysicalObject rdf:about="http://rdl.rdlfacade.org/data#RDS415124">

        <rdfs:subClassOf>

            <owl:Restriction>

                <owl:onProperty rdf:resource="#isPossessorIn"/>

                <owl:allValuesFrom rdf:resource="#ST-ELECTRIC_MOTOR-3401-026" />

                <owl:maxCardinality rdf:datatype="http://www.w3.org/2001/XMLSchema#nonNegativeInteger">1</owl:maxCardinality>

           </owl:Restriction>

        </rdfs:subClassOf>

    </part2:ClassOfInanimatePhysicalObject>

    <part2:ClassOfInanimatePhysicalObject rdf:about="http://rdl.rdlfacade.org/data#RDS415124">

        <rdfs:subClassOf>

            <owl:Restriction>

                <owl:onProperty rdf:resource="#isPossessorIn"/>

                <owl:allValuesFrom rdf:resource="#ST-ELECTRIC_MOTOR-3401-027" />

                <owl:maxCardinality rdf:datatype="http://www.w3.org/2001/XMLSchema#nonNegativeInteger">1</owl:maxCardinality>

           </owl:Restriction>

        </rdfs:subClassOf>

    </part2:ClassOfInanimatePhysicalObject>

    <part2:ClassOfMultidimensionalObject rdf:ID="ST-ELECTRIC_MOTOR-3401-025">

        <rdfs:subClassOf rdf:resource="http://tpl.rdlfacade.org/data#ST-3401"/>

        <rdfs:label xml:lang="en">Electric Motor allowable starting voltage percentage</rdfs:label>

        <rdfs:subClassOf>

            <owl:Restriction>

                <owl:onProperty rdf:resource="http://tpl.rdlfacade.org/data#possessor"/>

                <owl:allValuesFrom rdf:resource="http://rdl.rdlfacade.org/data#RDS415124"/> <!--ELECTRIC MOTOR-->

            </owl:Restriction>

        </rdfs:subClassOf>

        <rdfs:subClassOf>

            <owl:Restriction>

                <owl:onProperty rdf:resource="http://tpl.rdlfacade.org/data#propertyType"/>

                <owl:hasValue rdf:resource="http://rdl.rdlfacade.org/data#RDS13658045"/> <!--ALLOWABLE STARTING VOLTAGE PERCENTAGE-->

            </owl:Restriction>

        </rdfs:subClassOf>

        <rdfs:subClassOf>

            <owl:Restriction>

                <owl:onProperty rdf:resource="http://tpl.rdlfacade.org/data#unitOfMeasure"/>

                <owl:hasValue rdf:resource="http://rdl.rdlfacade.org/data#RDS13657820"/> <!--PERCENTAGE-->

            </owl:Restriction>

        </rdfs:subClassOf>

   </part2:ClassOfMultidimensionalObject>

    <part2:ClassOfMultidimensionalObject rdf:ID="ST-ELECTRIC_MOTOR-3401-026">

        <rdfs:subClassOf rdf:resource="http://tpl.rdlfacade.org/data#ST-3401"/>

        <rdfs:label xml:lang="en">Electric Motor breakdown torque</rdfs:label>

        <rdfs:subClassOf>

            <owl:Restriction>

                <owl:onProperty rdf:resource="http://tpl.rdlfacade.org/data#possessor"/>

                <owl:allValuesFrom rdf:resource="http://rdl.rdlfacade.org/data#RDS415124"/> <!--ELECTRIC MOTOR-->

            </owl:Restriction>

        </rdfs:subClassOf>

        <rdfs:subClassOf>

            <owl:Restriction>

                <owl:onProperty rdf:resource="http://tpl.rdlfacade.org/data#propertyType"/>

                <owl:hasValue rdf:resource="http://rdl.rdlfacade.org/data#RDS6652260"/> <!--BREAKDOWN TORQUE-->

            </owl:Restriction>

        </rdfs:subClassOf>

   </part2:ClassOfMultidimensionalObject>

    <part2:ClassOfMultidimensionalObject rdf:ID="ST-ELECTRIC_MOTOR-3401-027">

        <rdfs:subClassOf rdf:resource="http://tpl.rdlfacade.org/data#ST-3401"/>

        <rdfs:label xml:lang="en">Electric Motor cold locked rotor time</rdfs:label>

        <rdfs:subClassOf>

            <owl:Restriction>

                <owl:onProperty rdf:resource="http://tpl.rdlfacade.org/data#possessor"/>

                <owl:allValuesFrom rdf:resource="http://rdl.rdlfacade.org/data#RDS415124"/> <!--ELECTRIC MOTOR-->

            </owl:Restriction>

        </rdfs:subClassOf>

        <rdfs:subClassOf>

            <owl:Restriction>

                <owl:onProperty rdf:resource="http://tpl.rdlfacade.org/data#propertyType"/>

                <owl:hasValue rdf:resource="http://rdl.rdlfacade.org/data#RDS6450064"/> <!--COLD LOCKED ROTOR TIME-->

            </owl:Restriction>

        </rdfs:subClassOf>

   </part2:ClassOfMultidimensionalObject>

</rdf:RDF>