OKH-LD.ttl

# SPDX-License-Identifier: GPL-3.0-or-later

@base             <https://github.com/OPEN-NEXT/OKH-LOSH/raw/master/OKH-LOSH.ttl> .
@prefix okh:      <#> .
@prefix okshwa:   </oshwa-#> .
@prefix obo:      <http://purl.obolibrary.org/obo/> .
@prefix owl:      <http://www.w3.org/2002/07/owl#> .
@prefix rdf:      <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
@prefix rdfs:     <http://www.w3.org/2000/01/rdf-schema#> .
@prefix xsd:      <http://www.w3.org/2001/XMLSchema#> .
@prefix schema:   <http://schema.org/> .
@prefix spdxt:    <http://spdx.org/rdf/terms#> .
@prefix terms:    <http://purl.org/dc/terms/> .
@prefix epo:      <http://data.epo.org/linked-data/def/patent/> .
@prefix npg:      <http://ns.nature.com/terms/> .
@prefix otrl:     <https://github.com/OPEN-NEXT/OKH-LOSH/raw/master/OTRL.ttl#> .
@prefix tsdc:     <https://gitlab.com/OSEGermany/oh-tsdc/-/raw/master/oh-tsdc.ttl#> .

# NOTE:
# Regarding the use of `owl:unionOf` for `rdfs:domain` and `rdfs:range` in this ontology:
# Looking at the definitions for the later two properties:
# * https://www.w3.org/TR/rdf-schema/#ch_domain
# * https://www.w3.org/TR/rdf-schema/#ch_range
# and as described in this StackOverflow answer:
# <https://stackoverflow.com/a/23729566/586229>,
# multiple objects for the two properties mean,
# that *all of them* apply, simultaneously, not *one of them*.
# We want the *one of them* meaning though.
# To get that, in RDF/OWL logic,
# one needs to use the `owl:unionOf` approach.

<>
  a owl:Ontology ;
  owl:versionInfo "0.1" ;
  owl:versionIRI <> ;
  rdfs:label "OSH meta-data"@en ;
  rdfs:comment "Open Source Hardware metadata - Base Ontology"@en ;
  terms:contributor "Martin Häuer <martin.haeuer@ose-germany.de>" ;
  terms:contributor "Robin Vobruba <hoijui.quaero@gmail.com>" ;
  terms:license "GPL v3" .

# ----- CLASSES -----

okh:Component
  a owl:Class ;
  rdfs:label "Component"@en ;
  rdfs:comment "Either a module (MOSH) or Part (POSH); more component types may be added in the future"@en ;
  # That's the main class then!
  .

okh:Module
  a owl:Class ;
  rdfs:label "Module"@en ;
  rdfs:comment "Module of Open Source Hardware (MOSH)"@en ;
  rdfs:subClassOf okh:Component ;
  .

okh:Part
  a owl:Class ;
  rdfs:label "Part"@en ;
  rdfs:comment "Piece of Open Source Hardware (POSH)"@en ;
  rdfs:subClassOf okh:Component ;
  .

okh:Software
  a owl:Class ;
  rdfs:label "Software"@en ;
  rdfs:comment "Software (including firmware) needed to run & use the OSH" ;
  rdfs:subClassOf okh:Component ;
  .

okh:Reference
  a owl:Class ;
  rdfs:label "unambiguous reference" ;
  .

okh:Publication
  a owl:Class ;
  rdfs:label "Scientific Publication" ;
  rdfs:comment "_scientific_ (that is: peer reviewed) publication that _contains_ the design files";
  rdfs:subClassOf npg:Publication;
  .

okh:Standard
  a owl:Class ;
  rdfs:label "Technical Standard"@en ;
  rdfs:comment "official standard used in the _design_ (not e.g. DIN SPEC 3105-1)" ;
#  rdfs:subClassOf wd:Q317623 ;
  .

okh:WebsiteURL
  a owl:Class ;
  rdfs:label "Website URL" ;
  rdfs:subClassOf okh:Reference ;
  rdfs:subClassOf schema:URL ;
  .

okh:FileURL
  a owl:Class ;
  rdfs:label "permanent URL to file" ;
  rdfs:subClassOf okh:ComponentReference ;
  rdfs:subClassOf schema:URL ;
  .

okh:File
  a owl:Class ;
  rdfs:label "File" ;
  .

okh:ManifestFile
  a owl:Class ;
  rdfs:label "manifest file" ;
  rdfs:comment "file holding the metadata" ;
  rdfs:subClassOf okh:File
  .

okh:Readme
  a owl:Class ;
  rdfs:label "Readme" ;
  rdfs:subClassOf okh:File
  .

okh:ContributionGuide
  a owl:Class ;
  rdfs:label "Contribution Guide" ;
  rdfs:subClassOf okh:File
  .

okh:Image
  a owl:Class ;
  rdfs:label "Image" ;
  rdfs:subClassOf okh:File
  .

okh:BoM
  a owl:Class ;
  rdfs:label "Bill of Materials" ;
  rdfs:subClassOf okh:File
  .

okh:SourceFile
  a owl:Class ;
  rdfs:label "source file" ;
  rdfs:subClassOf okh:File ;
  .

okh:ExportFile
  a owl:Class ;
  rdfs:label "exported source file" ;
  rdfs:subClassOf okh:File ;
  .

okh:AuxiliaryFile
  a owl:Class ;
  rdfs:label "auxiliary file (neither source nor export)" ;
  rdfs:subClassOf okh:File ;
  .

okh:ManufacturingInstructions
  a owl:Class ;
  rdfs:label "Manufacturing Instructions" ;
  rdfs:subClassOf okh:File ;
  .

okh:UserManual
  a owl:Class ;
  rdfs:label "User Manual" ;
  rdfs:subClassOf okh:File ;
  .

okh:OuterDimensions
  a owl:Class ;
  rdfs:label "outer dimensions"@en ;
  rdfs:comment "…of a module or a part"@en
  .

okh:Mass
  a owl:Class ;
  rdfs:label "mass"@en ;
  rdfs:comment "…of a module or a part"@en
  .

okh:ComponentReference
  a owl:Class ;
  rdfs:subClassOf okh:Reference ;
  rdfs:label "Component Reference" ;
  rdfs:comment '''
    others shall be able to identify/procure this component only by the given reference(s),
    MOSH → URL to corresponding release
    POSH → URL to containing folder
    STD  → standard designation (preferably naming the _latest_ standard)
    BUY  → unambiguous reference'''@en ;
  .

# ----- PROPERTIES -----

okh:okhv
  a owl:DatatypeProperty ;
  rdfs:label "OKH version" ;
  rdfs:comment "version of OKH specification the metadata is following (different version → different data fields)" ;
  rdfs:subPropertyOf schema:version ;
  rdfs:domain okh:ManifestFile ;
  owl:cardinality 1
  .

okh:dataSource
  a owl:DatatypeProperty ;
  rdfs:label "Metadata Source" ;
  rdfs:comment "platform, where the crawler found the metadata (e.g. GitHub, Wikifactory)"@en ;
  rdfs:subClassOf schema:URL ;
  rdfs:domain okh:Module ;
  owl:cardinality 1
  .

okh:repoHost
  a owl:DatatypeProperty ;
  rdfs:label "Repo Host" ;
  rdfs:comment "platform, where the OSH documentation is located (e.g. GitLab, Wikifactory or any self-hosted website or wiki)"@en ;
  rdfs:subClassOf schema:URL ;
  rdfs:domain okh:Module ;
  owl:cardinality 1
  .

okh:uploadMethod
  a owl:DatatypeProperty ;
  rdfs:label "Upload Method" ;
  rdfs:comment "e.g. auto (fully integrated platforms) or manifest file (for connected platforms)"@en ;
  rdfs:range xsd:string ;
  rdfs:domain okh:Component ;
  owl:cardinality 1
  .

## ----- identification -----

okh:repository
  a owl:ObjectProperty ;
  rdfs:label "repository" ;
  rdfs:comment '''
    URL to the place where development happens (typically the repository)" ;
    following this link people shall be able to contribute to the development
    (reporting issues, suggesting changes, connecting to the team etc.)" '''@en;
  rdfs:subPropertyOf schema:codeRepository ;
  rdfs:range okh:WebsiteURL ;
  owl:cardinality 1 ;
  rdfs:domain okh:Module ;
  .

okh:repoSnapshot
  a owl:ObjectProperty ;
  rdfs:label "URL respository snapshot (=specific version)" ;
  rdfs:comment "LOSH-Krawler takes the commit hash from the version tag and creates this permalink" ;
  rdfs:subPropertyOf okh:repository ;
  rdfs:range okh:WebsiteURL ;
  owl:cardinality 1 ;
  rdfs:domain okh:Module ;
  .

okh:version
  a owl:DatatypeProperty ;
  rdfs:label "version" ;
  rdfs:comment "version of this Component, preferably in the semantic versioning scheme (semver.org)" ;
  rdfs:subPropertyOf schema:version ;
  rdfs:domain okh:Module ;
  owl:cardinality 1
  .

okh:forkOf
 a owl:ObjectProperty ;
 rdfs:label "fork of" ;
 rdfs:subPropertyOf schema:isBasedOn ;
 owl:cardinality 1 ;
 rdfs:domain [ owl:unionOf (okh:Module okh:Part) ] ;
 .

okh:versionOf
  a owl:ObjectProperty ;
  rdfs:label "version of" ;
  rdfs:comment "connects specific versions of Modules with their versionless superclass" ;
  rdfs:range okh:Module ;
  rdfs:domain okh:Module ;
  .

okh:documentationLanguage
 a owl:DatatypeProperty ;
 rdfs:label "documentation language" ;
 rdfs:comment '''
  IETF language tag
  following the BCP 47 standard e.g. en-GB
  denotes the language of the documentation for the component subject '''@en;
 rdfs:subPropertyOf schema:inLanguage ;
 owl:cardinality 1 ;
 rdfs:domain [ owl:unionOf (okh:Module okh:Part) ] ;
 .

## ----- legal -----

okh:licensor
  a owl:ObjectProperty ;
  rdfs:label "licensor" ;
  rdfs:comment "organization/individual behind the hardware design (holder of intellectual property)" ;
  rdfs:subPropertyOf schema:copyrightHolder ;
  rdfs:range [ owl:unionOf (schema:Person schema:Organization) ] ;
  rdfs:domain okh:Module ;
  owl:cardinality 1
  .

okh:organization
  a owl:ObjectProperty ;
  rdfs:label "organization" ;
  rdfs:comment "organization representing (most) contributors of this project" ;
  rdfs:range schema:Organization ;
  rdfs:domain okh:Module ;
  .

okh:spdxLicense
 a owl:ObjectProperty ;
 rdfs:label "SPDX license identifier" ;
 rdfs:comment "view complete list under https://spdx.org/licenses/" ;
 rdfs:domain okh:Module ;
 rdfs:range spdxt:ListedLicense ; # aka SPDX license identifier for a single, atomar license
 owl:cardinality 1 ;
 .

okh:alternativeLicense
  a owl:ObjectProperty ;
  rdfs:label "non-SPDX license" ;
  rdfs:comment "URL to legal code of a license without SPDX identifier, hence OSHWA-compliance is to be checked manually" ;
#  rdfs:subPropertyOf spdxt:License ;
  rdfs:domain okh:Module ;
  rdfs:range okh:FileURL ;
  owl:cardinality 1 ;
  .

## ----- informative -----

# okh:contributorCount
#   a owl:DatatypeProperty ;
#   rdfs:label "number of conributors participating in the project" ;
#   rdfs:domain okh:Module ;
#   rdfs:range xsd:int ;
#   .

## ----- development stage -----

okh:technologyReadinessLevel
  a owl:ObjectProperty ;
  rdfs:label "Technology Readiness Level (TRL)" ;
  rdfs:comment "…using the OTRL definitions" ;
  owl:cardinality 1 ;
  rdfs:range otrl:OTRL ;
  rdfs:domain okh:Module ;
  .

okh:documentationReadinessLevel
  a owl:ObjectProperty ;
  rdfs:label "Documentation Readiness Level (DLR)" ;
  rdfs:comment "…using the ODRL definitions" ;
  owl:cardinality 1 ;
  rdfs:range otrl:ODRL ;
  rdfs:domain okh:Module ;
  .

okh:attestation
  a owl:ObjectProperty ;
  rdfs:label "attestation" ;
  rdfs:comment "permanent URL to evidence of compliance (OSHWA, FSF, DIN SPEC 3105)" ;
  rdfs:range okh:WebsiteURL ;
  rdfs:domain okh:Module ;
  .

okh:hasPublication
  a owl:ObjectProperty ;
  rdfs:label "has Publication" ;
  rdfs:comment "design files of this OSH modules have been peer reviewed in a scientific publication" ;
  rdfs:subPropertyOf npg:hasPublication;
  rdfs:domain okh:Module ;
  .

# okh:certificate
#   a owl:ObjectProperty ;
#   rdfs:label "certificate" ;
#   rdfs:comment "official certificate, such as CE mark" ;
# FIXME rdfs:subPropertyOf ;
#   rdfs:domain okh:Module ;
#   .

## ----- basic description -----

okh:cpcPatentClass
 a owl:ObjectProperty ;
 rdfs:label "Patent Class" ;
 rdfs:comment "International Patent Classification (IPC)" ;
 rdfs:subPropertyOf epo:classificationIPCInventive;
 rdfs:domain okh:Module ;
 .

okh:compliesWith
  a owl:ObjectProperty ;
  rdfs:label "complies with a technical standard" ;
#  rdfs:subPropertyOf wdp:P5009 ;
  rdfs:domain okh:Component ;
  .

okh:standardID
  a owl:DatatypeProperty ;
  rdfs:label "Document Identifier for the technical Standard" ;
#  rdfs:subPropertyOf wdp:P5046 ;
  rdfs:range xsd:string ;
  rdfs:domain okh:Standard ;
  .

okh:function
  a owl:DatatypeProperty ;
  rdfs:label "functional description" ;
  rdfs:comment '''
    functional description, e.g. what it actually does, what problem it solves, for whom, under which conditions etc.
    so if you wish that someone finds & uses your okh specifically e.g. for COVID-19-crisis response, include relevant keywords in this field
    optional: description of input, output and interfaces'''@en ;
  rdfs:subPropertyOf obo:BFO_0000016 ; # aka function
  owl:cardinality 1 ;
  rdfs:domain okh:Module ;
  .

okh:hasReadme
  a owl:ObjectProperty ;
  rdfs:label "has Readme" ;
  rdfs:comment "links to the corresponding Readme" ;
  rdfs:range okh:Readme ;
  rdfs:domain okh:Module ;
  .

okh:hasContributionGuide
  a owl:ObjectProperty ;
  rdfs:label "has Contribution Guide" ;
  rdfs:comment "links to the corresponding Contribution Guide" ;
  rdfs:range okh:ContributionGuide ;
  rdfs:domain okh:Module ;
  .

okh:hasBoM
  a owl:ObjectProperty ;
  rdfs:label "has Bill of Materials" ;
  rdfs:comment "links to the corresponding Bill of Materials" ;
  rdfs:range okh:BoM ;
  rdfs:domain okh:Module ;
  .

okh:hasComponent
  a owl:ObjectProperty ;
  rdfs:label "has Component" ;
  rdfs:comment "links to parts of the module" ;
  rdfs:range okh:Part ;
  rdfs:domain okh:Module ;
  .

okh:usesModule
  a owl:ObjectProperty ;
  rdfs:label "uses Module" ;
  rdfs:comment "refers to a *release*/snapshot of an (external) OSH Module used in this design (should also appear in the BoM)" ;
  rdfs:range [ owl:unionOf (okh:Module okh:WebsiteURL) ] ;
  rdfs:domain okh:Module ;
  .

okh:hasImage
  a owl:ObjectProperty ;
  rdfs:label "has image" ;
  rdfs:comment "links to the corresponding Image" ;
  rdfs:subPropertyOf schema:image ;
  rdfs:range okh:Image ;
  rdfs:domain okh:Component ;
  .

okh:functionalMetadata
  a owl:DatatypeProperty ;
  rdfs:label "functionality metadata" ;
  rdfs:comment "Metadata addressing functionality, such as dimensions, material, weight, RPM,… (not standardised)" ;
  rdfs:subPropertyOf schema:value ;
  rdfs:range schema:StructuredValue ;
  rdfs:domain okh:Module ;
  .

okh:productionMetadata
  a owl:ObjectProperty ;
  rdfs:label "production metadata" ;
  rdfs:comment "production-relevant metadata, such as material, manufacturing technology, outer dimensions, smallest tolerance, finest surface roughness" ;
  rdfs:subPropertyOf schema:value ;
  rdfs:range schema:StructuredValue ;
  rdfs:domain [ owl:unionOf (okh:Module okh:Part) ] ;
  .

## ----- production metadata -----

okh:manufacturingProcess
  a owl:DatatypeProperty ;
  rdfs:label "manufacturing process" ;
  rdfs:subPropertyOf okh:productionMetadata ;
  .

okh:material
  a owl:DatatypeProperty ;
  rdfs:label "material" ;
  rdfs:subPropertyOf okh:productionMetadata ;
  .

okh:hasOuterDimensions
  a owl:ObjectProperty ;
  rdfs:label "outer dimensions using openSCAD primitives" ;
  rdfs:comment "https://en.wikibooks.org/wiki/OpenSCAD_User_Manual/Primitive_Solids" ;
  .

okh:hasMass
  a owl:ObjectProperty ;
  rdfs:label "mass of the component" ;
  rdfs:subPropertyOf okh:productionMetadata ;
  .

okh:openScad
  a owl:DatatypeProperty ;
  rdfs:label "material" ;
  rdfs:subPropertyOf okh:productionMetadata ;
  rdfs:domain okh:OuterDimensions ;
  .

okh:unit
  a owl:DatatypeProperty ;
  rdfs:label "unit" ;
  rdfs:comment "mm, cm, m, g, kg" ;
  rdfs:subPropertyOf okh:productionMetadata ;
  rdfs:domain [ owl:unionOf (okh:OuterDimensions okh:Mass) ] ;
  .

okh:value
  a owl:DatatypeProperty ;
  rdfs:label "value" ;
  rdfs:subPropertyOf okh:productionMetadata ;
  rdfs:domain okh:Mass ;
  .

okh:smallestToleranceClass
  a owl:ObjectProperty ;
  rdfs:label "smallest tolerance class (following ISO 286)" ;
# fixme rdfs:subPropertyOf ;
  rdfs:subPropertyOf okh:productionMetadata ;
  rdfs:domain okh:Part ;
  .

## ----- design files -----
## (diving into the documentation)

# okh:assemblyInstruction
#   a owl:ObjectProperty ;
#   rdfs:label "assembly instruction" ;
#   rdfs:comment "can be a technical drawing, instruction etc." ;
#   rdfs:range okh:FileURL ;
#   rdfs:domain okh:Module ;
#   .

okh:hasManifestFile
  a owl:ObjectProperty ;
  rdfs:label "has manifest file" ;
  rdfs:range okh:ManifestFile ;
  rdfs:domain [ owl:unionOf (okh:Module okh:Part) ] ;
  .

okh:doi
  a owl:DatatypeProperty ;
  rdfs:label "DOI"@en ;
  rdfs:comment "this publication has a digital object identifier (DOI)"@en ;
  rdfs:domain okh:Publication ;
  rdfs:subPropertyOf npg:doi ;
  rdfs:range rdfs:Literal ;
  .

okh:fileURL
  a owl:ObjectProperty ;
  rdfs:label "file URL" ;
#  rdfs:subPropertyOf schema:URL ; # NOTE This is not valid, because schema:URL is a class, not a property
  rdfs:domain okh:File ;
  .

okh:fileFormat
  a owl:ObjectProperty ;
  rdfs:label "file format" ;
  rdfs:subPropertyOf schema:fileFormat ;
  rdfs:domain okh:File ;
  .

okh:timestamp
  a owl:ObjectProperty ;
  rdfs:label "timestamp" ;
  rdfs:comment "following ISO 8601" ;
# FixMe  rdfs:subPropertyOf
  rdfs:domain okh:Module ;
  .

okh:source
  a owl:ObjectProperty ;
  rdfs:label "source file" ;
  rdfs:comment "relative link to a source file" ;
  rdfs:range okh:SourceFile ;
  rdfs:domain [ owl:unionOf (okh:Module okh:Part) ] ;
  .

okh:export
  a owl:ObjectProperty ;
  rdfs:label "exported source file" ;
  rdfs:comment "URL to a (generated) exported source file" ;
  rdfs:range okh:ExportFile ;
  rdfs:domain [ owl:unionOf (okh:Module okh:Part) ] ;
  .

okh:auxiliary
  a owl:ObjectProperty ;
  rdfs:label "has auxiliary file" ;
  rdfs:comment "reference to an auxiliary file" ;
  rdfs:range okh:AuxiliaryFile ;
  rdfs:domain [ owl:unionOf (okh:Module okh:Part) ] ;
  .

okh:hasUserManual
  a owl:ObjectProperty ;
  rdfs:label "has User Manual" ;
  rdfs:range okh:UserManual ;
  rdfs:domain okh:Module ;
  .

okh:hasManufacturingInstructions
  a owl:ObjectProperty ;
  rdfs:label "has Manufacturing Instructions" ;
  rdfs:range okh:ManufacturingInstructions ;
  rdfs:domain [ owl:unionOf (okh:Module okh:Part) ] ;
  .

okh:relatedTsDC
  a owl:ObjectProperty ;
  rdfs:label "related TsDC" ;
  rdfs:comment "Identifier for the applying Technology-specific Documentation Criteria according to DIN SPEC 3105-1, e.g. `tsdc:3DP`" ;
  # FIXME rdfs:subPropertyOf ;
  rdfs:range tsdc:OHTsDC ;
  rdfs:domain okh:Component
  .

# source, export

okh:hasSoftware
  a owl:ObjectProperty ;
  rdfs:label "has Software" ;
  rdfs:range okh:Software ;
  rdfs:domain okh:Module ;
  .

okh:release
  a owl:DatatypeProperty ;
  rdfs:label "release" ;
  rdfs:comment "URL to release" ;
#  rdfs:subClassOf schema:URL ;
  rdfs:domain [ owl:unionOf (okh:Module okh:Software) ] ;
  .

okh:installationGuide
  a owl:DatatypeProperty ;
  rdfs:label "Installation Guide" ;
#  rdfs:subClassOf schema:URL ;
  rdfs:domain okh:Software ;
  .

# ----- platform-specific fields -----
## ----- OSHWA -----

okshwa:primaryType
  a owl:DatatypeProperty ;
  rdfs:label "primary category"@en ;
  rdfs:comment "…as stated at OSHWA - possilbe values: 3D Printing, Agriculture, Arts, Education, Electronics, Enclosure, Environmental, Home Connection, IOT, Manufacturing, Other, Robotics, Science, Sound, Space, Tool, Wearables"@en ;
  rdfs:range xsd:string ;
  rdfs:domain okh:Module ;
  .

okshwa:additionalType
  a owl:DatatypeProperty ;
  rdfs:label "additional category"@en ;
  rdfs:comment "…as stated at OSHWA - possilbe values: 3D Printing, Agriculture, Arts, Education, Electronics, Enclosure, Environmental, Home Connection, IOT, Manufacturing, Other, Robotics, Science, Sound, Space, Tool, Wearables"@en ;
  rdfs:range xsd:string ;
  rdfs:domain okh:Module ;
  .

okshwa:hardwareLicense
  a owl:DatatypeProperty ;
  rdfs:label "hardware license"@en ;
  rdfs:comment "…as stated at OSHWA"@en ;
  rdfs:subPropertyOf okh:spdxLicense ;
  rdfs:domain okh:Module ;
  .

okshwa:softwareLicense
  a owl:DatatypeProperty ;
  rdfs:label "software license"@en ;
  rdfs:comment "…as stated at OSHWA"@en ;
  rdfs:subPropertyOf okh:spdxLicense ;
  rdfs:domain okh:Module ;
  .

okshwa:documentationLicense
  a owl:DatatypeProperty ;
  rdfs:label "documenation license"@en ;
  rdfs:comment "…as stated at OSHWA"@en ;
  rdfs:subPropertyOf okh:spdxLicense ;
  rdfs:domain okh:Module ;
  .

okshwa:country
  a owl:DatatypeProperty ;
  rdfs:label "origin (country)"@en ;
  rdfs:comment "…as stated at OSHWA"@en ;
  rdfs:range xsd:string ;
  rdfs:domain okh:Module ;
  .

okshwa:certificationDate
  a owl:DatatypeProperty ;
  rdfs:label "certification date"@en ;
  rdfs:comment "…as stated at OSHWA"@en ;
  rdfs:domain okh:Module ;
  .

## ----- Wikifactory -----

# see https://github.com/OPEN-NEXT/LOSH-Reporter/issues/8

## ----- Thingiverse -----

# nothing so far, since this would slow down fetching enormously

### ----- source/export subproperties -----
### (from TsDC)
#
#okh:rationale
#  a owl:ObjectProperty ;
#  rdfs:label "rationale" ;
#  rdfs:range [ owl:unionOf (okh:source okh:export) ] ;
#  rdfs:domain okh:Component ;
#  .
#
#okh:design
#  a owl:ObjectProperty ;
#  rdfs:label "design file" ;
#  rdfs:range [ owl:unionOf (okh:source okh:export) ] ;
#  rdfs:domain [ owl:unionOf (okh:Module okh:Part) ] ;
#  .