@prefix dcterms: <http://purl.org/dc/terms/>.
@prefix foaf: <http://xmlns.com/foaf/0.1/>.
@prefix wdrs: <http://www.w3.org/2007/05/powder-s#>.
@prefix owl: <http://www.w3.org/2002/07/owl#>.
@prefix xsd: <http://www.w3.org/2001/XMLSchema#>.
@prefix gr: <http://purl.org/goodrelations/v1#>.
@prefix xml: <http://www.w3.org/XML/1998/namespace>.
@prefix vcard: <http://www.w3.org/2006/vcard/ns#>.
@prefix dc: <http://purl.org/dc/elements/1.1/>.
@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>.
@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#>.
@prefix pto: <http://www.productontology.org/id/>.
@prefix schema: <http://schema.org/>.


# OWL DL work-arounds (instead of imports)
dc:contributor a owl:AnnotationProperty.
dc:creator a owl:AnnotationProperty.
dc:rights a owl:AnnotationProperty.
dc:subject a owl:AnnotationProperty.
dc:title a owl:AnnotationProperty.
dcterms:license a owl:AnnotationProperty.
wdrs:describedby a owl:AnnotationProperty.
foaf:Document a owl:Class.
foaf:homepage a owl:AnnotationProperty.
foaf:page a owl:AnnotationProperty.
foaf:primaryTopic a owl:AnnotationProperty.
schema:Product a owl:Class.


#OWL 1 DL compatibility of the OWL2 deprecated property
owl:deprecated a owl:AnnotationProperty.

<http://www.productontology.org/#> 	a owl:Ontology;
	dc:title "PTO: The Product Types Ontology for Semantic Web-based E-Commerce"@en;
	rdfs:comment """The Product Types Ontology: Good identifiers for product types based on Wikipedia

This service provides GoodRelations-compatible class definitions for any type of product or service that has an entry in the English Wikipedia.

Vocabulary:    http://www.productontology.org/#
Namespace:     http://www.productontology.org/

The Product Types Ontology is designed to be used in combination with GoodRelations, a standard vocabulary for the commercial aspects of offers.

See http://purl.org/goodrelations/ for more information."""@en;
	rdfs:label "The Product Types Ontology for Semantic Web-based E-Commerce"@en;
	dc:contributor "The class abstracts and translations of labels are taken from Wikipedia, the free encyclopedia."@en;
	dc:creator "Martin Hepp"@en;
	dc:rights "The class definition texts are taken from Wikipedia, the free encyclopedia under a Creative Commons Attribution-ShareAlike 3.0 Unported (CC BY-SA 3.0) license, see http://creativecommons.org/licenses/by-sa/3.0/. Accordingly, all ontology class definitions provided in here are available under the very same license."@en;
	dc:subject "E-Commerce, E-Business, GoodRelations, Ontology, Wikipedia, DBPedia"@en;
	dcterms:license <http://creativecommons.org/licenses/by-sa/3.0/>;
	rdfs:seeAlso <http://purl.org/goodrelations/v1>;
	owl:imports <http://purl.org/goodrelations/v1>;
	owl:versionInfo "2026-08-28T18:24:40.944920".

<http://www.productontology.org/> a foaf:Document;
	foaf:primaryTopic <http://www.productontology.org/#>.

<http://www.productontology.org/doc/Flywheel.rdf> a foaf:Document;
	foaf:primaryTopic <http://www.productontology.org/id/Flywheel>.
<http://www.productontology.org/doc/Flywheel.ttl> a foaf:Document;
	foaf:primaryTopic <http://www.productontology.org/id/Flywheel>.
<http://www.productontology.org/doc/Flywheel> a foaf:Document;
	foaf:primaryTopic <http://www.productontology.org/id/Flywheel>.
	
<http://www.productontology.org/id/Flywheel> a owl:Class;
	rdfs:subClassOf gr:ProductOrService, schema:Product;
	rdfs:label "Flywheel"@en;
	rdfs:comment """A flywheel is a mechanical device that uses the conservation of angular momentum to store rotational energy, a form of kinetic energy proportional to the product of its moment of inertia and the square of its rotational speed. In particular, assuming the flywheel&#39;s moment of inertia is constant (i.e., a flywheel with fixed mass and second moment of area revolving about some fixed axis) then the stored (rotational) energy is directly associated with the square of its rotational speed.
Since a flywheel serves to store mechanical energy for later use, it is natural to consider it as a kinetic energy analogue of an electrical inductor. Once suitably abstracted, this shared principle of energy storage is described in the generalized concept of an accumulator. As with other types of accumulators, a flywheel inherently smooths sufficiently small deviations in the power output of a system, thereby effectively playing the role of a low-pass filter with respect to the mechanical velocity (angular, or otherwise) of the system. More precisely, a flywheel&#39;s stored energy will donate a surge in power output upon a drop in power input and will conversely absorb any excess power input (system-generated power) in the form of rotational energy.
Common uses of a flywheel include smoothing a power output in reciprocating engines, flywheel energy storage, delivering energy at higher rates than the source, and controlling the orientation of a mechanical system using gyroscope and reaction wheel. Flywheels are typically made of steel and rotate on conventional bearings; these are generally limited to a maximum revolution rate of a few thousand RPM. High energy density flywheels can be made of carbon fiber composites and employ magnetic bearings, enabling them to revolve at speeds up to 60,000 RPM (1 kHz). 

(Source: Wikipedia, the free encyclopedia, see http://en.wikipedia.org/wiki/Flywheel)"""@en;
	rdfs:isDefinedBy <http://www.productontology.org/#>;
	rdfs:label "Vliegwiel"@af; 
	rdfs:label "حذافة"@ar; 
	rdfs:label "Nazimçarx"@az; 
	rdfs:label "Махавік"@be; 
	rdfs:label "Махавік"@be-tarask; 
	rdfs:label "Маховик"@bg; 
	rdfs:label "ফ্লাইহুইল"@bn; 
	rdfs:label "ཤུགས་འཁོར།"@bo; 
	rdfs:label "Zamajac"@bs; 
	rdfs:label "Volant d&#39;inèrcia"@ca; 

	rdfs:seeAlso <http://www.productontology.org/>,
		<http://dbpedia.org/resource/Flywheel>,
		<http://www.productontology.org/doc/Flywheel>;

	wdrs:describedby <http://www.productontology.org/doc/Flywheel.rdf>, <http://www.productontology.org/doc/Flywheel.ttl>;
	foaf:homepage <http://www.productontology.org/doc/Flywheel.html>;
	foaf:page <http://en.wikipedia.org/wiki/Flywheel>.