@prefix : <https://purl.org/signal-description-ontology#> .
@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
@prefix owl: <http://www.w3.org/2002/07/owl#> .
@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .
@prefix mod: <https://w3id.org/mod#> .
@prefix dcterms: <http://purl.org/dc/terms/> .
@prefix qudt: <http://qudt.org/schema/qudt/> .
@prefix sdo: <https://purl.org/signal-description-ontology#> .
@prefix core: <https://purl.org/signal-description-ontology/core#> .
@prefix opcua: <https://purl.org/signal-description-ontology/opcua#> .
@prefix influxdb: <https://purl.org/signal-description-ontology/influxdb#> .
@base <https://purl.org/signal-description-ontology#> .

<https://purl.org/signal-description-ontology#> a owl:Ontology ;
    dcterms:created "2025-09-25"^^xsd:date ;
    dcterms:creator "http://example.org/people#AlexanderEbner" ;
    dcterms:description "An ontology for integrating data sources providing time series data based on signal descriptions."@en ;
    dcterms:title "Signal Description Ontology"@en ;
    owl:versionInfo "0.1" ;
    mod:createdWith <https://chowlk.linkeddata.es/> ;
    dcterms:license <https://creativecommons.org/licenses/by/4.0/> .

qudt:Unit a owl:Class ;
    rdfs:label "Unit" ;
    rdfs:comment "Refers to a QUDT Unit" .

rdfs:Datatype a owl:Class ;
    rdfs:label "Datatype" ;
    rdfs:comment "Refers to a RDFS Datatype" .

# ---------------------------------------------------
# Annotation Properties
# ---------------------------------------------------

dcterms:created a owl:AnnotationProperty .

dcterms:creator a owl:AnnotationProperty .

dcterms:description a owl:AnnotationProperty .

dcterms:title a owl:AnnotationProperty .

dcterms:license rdf:type owl:AnnotationProperty .

owl:versionInfo a owl:AnnotationProperty .

mod:createdWith rdf:type owl:AnnotationProperty .

# ---------------------------------------------------
# Data Types
# ---------------------------------------------------

core:signalType rdf:type rdfs:Datatype .

opcua:mode rdf:type rdfs:Datatype .

# ---------------------------------------------------
# Core Classes
# ---------------------------------------------------

core:Asset a owl:Class ;
    rdfs:label "Asset" ;
    rdfs:comment "Represents a physical or logical object that provides signals or contains other assets." .

core:SignalDescription a owl:Class ;
    rdfs:label "Signal Description" ;
    rdfs:comment "Contains the information to enable interpretation and data access of a signal." .

core:ConnectionInfo a owl:Class ;
    rdfs:label "Connection Info" ;
    owl:disjointUnionOf (influxdb:InfluxDbConnectionInfo opcua:OpcUaConnectionInfo) ;
    rdfs:comment "Contains the information required to connect to a source." .

core:Credentials a owl:Class ;
    rdfs:label "Credentials" ;
    owl:disjointUnionOf (core:UserPassCredentials core:CertCredentials core:TokenCredentials) ;
    rdfs:comment "Serves as supertype for different authentication methods." .

core:DataAccess a owl:Class ;
    rdfs:label "Data Access" ;
    owl:disjointUnionOf (influxdb:InfluxDbAccess opcua:OpcUaAccess) ;
    rdfs:comment "Serves as supertype for technology-specific types of data access, used to obtain signal values." .

core:KeyValuePair a owl:Class ;
    rdfs:label "Key-Value Pair" ;
    owl:disjointUnionOf (core:MetaData influxdb:Tag) ;
    rdfs:comment "Represents data the in form of a key and a value." .

core:MetaData a owl:Class ;
    rdfs:label "Meta Data" ;
    rdfs:subClassOf core:KeyValuePair ;
    rdfs:comment "A key-value pair that adds information about a signal." .

core:TokenCredentials a owl:Class ;
    rdfs:label "Token Credentials" ;
    rdfs:subClassOf core:Credentials ;
    rdfs:comment "Represents authentication based on tokens." .

core:CertCredentials a owl:Class ;
    rdfs:label "Cert Credentials" ;
    rdfs:subClassOf core:Credentials ;
    rdfs:comment "Represents authentication using certificates." .

core:UserPassCredentials a owl:Class ;
    rdfs:label "User Pass Credentials" ;
    rdfs:subClassOf core:Credentials ;
    rdfs:comment "Represents authentication based on username and password." .

# ---------------------------------------------------
# Core Properties
# ---------------------------------------------------

core:hasAsset a owl:ObjectProperty , owl:TransitiveProperty ;
    rdfs:label "has asset" ;
    rdfs:domain core:Asset ;
    rdfs:range core:Asset ;
    owl:inverseOf core:isAssetOf ;
    rdfs:comment "Links an Asset to another Asset it contains to." .

core:isAssetOf a owl:ObjectProperty , owl:TransitiveProperty ;
    rdfs:label "is asset of" ;
    rdfs:domain core:Asset ;
    rdfs:range core:Asset ;
    owl:inverseOf core:hasAsset ;
    rdfs:comment "Links an Asset to another Asset contained by it." .

core:hasSignalDescription a owl:ObjectProperty ;
    rdfs:label "has signal description" ;
    rdfs:domain core:Asset ;
    rdfs:range core:SignalDescription ;
    owl:inverseOf core:isSignalDescriptionOf ;
    rdfs:comment "Links a SignalDescription to a Asset it contains to." .

core:isSignalDescriptionOf a owl:ObjectProperty ;
    rdfs:label "is signal description of" ;
    rdfs:domain core:SignalDescription ;
    rdfs:range core:Asset ;
    owl:inverseOf core:hasSignalDescription ;
    rdfs:comment "Links an Asset to a SignalDescription contained by it." .

core:hasSignalType a owl:DatatypeProperty ;
    rdfs:label "has signal type" ;
    rdfs:comment "A enumeration that determines how values between the data samples are interpreted." ;
    rdfs:domain core:SignalDescription ;
    rdfs:range [ a rdfs:Datatype ;
            owl:oneOf [ a rdf:List ;
                    rdf:first "Observations"^^core:signalType ;
                    rdf:rest [ a rdf:List ;
                            rdf:first "HoldObservations"^^core:signalType ;
                            rdf:rest [ a rdf:List ;
                                    rdf:first "LinearInterpolation"^^core:signalType ;
                                    rdf:rest () ] ] ] ] .

core:hasDataType a owl:ObjectProperty ;
    rdfs:label "has data type" ;
    rdfs:domain core:SignalDescription ;
    rdfs:range rdfs:Datatype ;
    owl:inverseOf core:isDataTypeOf ;
    rdfs:comment "Links a Datatype to a SignalDescription it refers to." .

core:isDataTypeOf a owl:ObjectProperty ;
    rdfs:label "is data type of" ;
    rdfs:domain rdfs:Datatype ;
    rdfs:range core:SignalDescription ;
    owl:inverseOf core:hasDataType ;
    rdfs:comment "Links a SignalDescription to a Datatype referred by it." .

core:hasUnit a owl:ObjectProperty ;
    rdfs:label "has unit" ;
    rdfs:domain core:SignalDescription ;
    rdfs:range qudt:Unit ;
    owl:inverseOf core:isUnitOf ;
    rdfs:comment "Links a Unit to a SignalDescription its values are measured by." .

core:isUnitOf a owl:ObjectProperty ;
    rdfs:label "is unit of" ;
    rdfs:domain qudt:Unit ;
    rdfs:range core:SignalDescription ;
    owl:inverseOf core:hasUnit ;
    rdfs:comment "Links a SignalDescription to a Unit measuring it." .

core:hasHistAccess a owl:ObjectProperty ;
    rdfs:label "has historical access" ;
    rdfs:domain core:SignalDescription ;
    rdfs:range core:DataAccess ;
    owl:inverseOf core:isHistAccessOf ;
    rdfs:comment "Links historical DataAccess to a SignalDescription providing it." .

core:isHistAccessOf a owl:ObjectProperty ;
    rdfs:label "is historical access of" ;
    rdfs:domain core:DataAccess ;
    rdfs:range core:SignalDescription ;
    owl:inverseOf core:hasHistAccess ;
    rdfs:comment "Links SignalDescription to historical DataAccess provided by it." .

core:hasNrtAccess a owl:ObjectProperty ;
    rdfs:label "has near real-time access" ;
    rdfs:domain core:SignalDescription ;
    rdfs:range core:DataAccess ;
    owl:inverseOf core:isNrtAccessOf ;
    rdfs:comment "Links near real-time DataAccess to a SignalDescription providing it." .

core:isNrtAccessOf a owl:ObjectProperty ;
    rdfs:label "is near real-time access of" ;
    rdfs:domain core:DataAccess ;
    rdfs:range core:SignalDescription ;
    owl:inverseOf core:hasNrtAccess ;
    rdfs:comment "Links SignalDescription to near real-time DataAccess provided by it." .

core:hasKey a owl:DatatypeProperty ;
    rdfs:label "has key" ;
    rdfs:domain core:KeyValuePair ;
    rdfs:range xsd:string ;
    rdfs:comment "The key of a key-value pair." .

core:hasValue a owl:DatatypeProperty ;
    rdfs:label "has value" ;
    rdfs:domain core:KeyValuePair ;
    rdfs:range rdfs:Literal ;
    rdfs:comment "The value of a key-value pair." .

core:hasMetadata a owl:ObjectProperty ;
    rdfs:label "has metadata" ;
    rdfs:domain core:SignalDescription ;
    rdfs:range core:MetaData ;
    owl:inverseOf core:isMetadataOf ;
    rdfs:comment "Links a metadata to a SignalDescription described by." .

core:isMetadataOf a owl:ObjectProperty ;
    rdfs:label "is metadata of" ;
    rdfs:domain core:MetaData ;
    rdfs:range core:SignalDescription ;
    owl:inverseOf core:hasMetadata ;
    rdfs:comment "Links a SignalDescription to a metadata describing it." .

core:hasURL a owl:DatatypeProperty ;
    rdfs:label "has URL" ;
    rdfs:domain core:ConnectionInfo ;
    rdfs:range xsd:anyURI ;
    rdfs:comment "The URL of a connection." .

core:hasCredentials a owl:ObjectProperty ;
    rdfs:label "has credentials" ;
    rdfs:domain core:ConnectionInfo ;
    rdfs:range core:Credentials ;
    owl:inverseOf core:isCredentialsOf ;
    rdfs:comment "Links Credentials to a ConnectionInfo providing it for authentication." .

core:isCredentialsOf a owl:ObjectProperty ;
    rdfs:label "is credentials of" ;
    rdfs:domain core:Credentials ;
    rdfs:range core:ConnectionInfo ;
    owl:inverseOf core:hasCredentials ;
    rdfs:comment "Links a ConnectionInfo to Credentials provided by it for authentication." .

core:hasUsername a owl:DatatypeProperty ;
    rdfs:label "has username" ;
    rdfs:domain core:UserPassCredentials ;
    rdfs:range xsd:string ;
    rdfs:comment "The username used for username-password credentials." .

core:hasPassword a owl:DatatypeProperty ;
    rdfs:label "has password" ;
    rdfs:domain core:UserPassCredentials ;
    rdfs:range xsd:string ;
    rdfs:comment "The password used for username-password credentials." .

core:hasCert a owl:DatatypeProperty ;
    rdfs:label "has certificate" ;
    rdfs:domain core:CertCredentials ;
    rdfs:range xsd:anyURI ;
    rdfs:comment "The certificate used for certificate-based authentication." .

core:hasPrivateKey a owl:DatatypeProperty ;
    rdfs:label "has private key" ;
    rdfs:domain core:CertCredentials ;
    rdfs:range xsd:anyURI ;
    rdfs:comment "The private key used for certificate-based authentication." .

core:hasToken a owl:DatatypeProperty ;
    rdfs:label "has token" ;
    rdfs:domain core:TokenCredentials ;
    rdfs:range xsd:string ;
    rdfs:comment "The token used for token-based authentication." .

# ---------------------------------------------------
# OPC UA Classes
# ---------------------------------------------------

opcua:OpcUaConnectionInfo a owl:Class ;
    rdfs:label "Opc Ua Connection Info" ;
    rdfs:subClassOf core:ConnectionInfo ;
    rdfs:comment "Contains the information required to connect to an OPC UA server." .

opcua:OpcUaAccess a owl:Class ;
    rdfs:label "Opc Ua Access" ;
    rdfs:subClassOf core:DataAccess ;
    rdfs:comment "Contains the information used to access OPC UA nodes." .

opcua:MessageSecurity a owl:Class ;
    rdfs:label "Message Security" ;
    rdfs:comment "Contains the information required to establish a secure channel in OPC UA." .

# ---------------------------------------------------
# OPC UA Properties
# ---------------------------------------------------

opcua:hasServerIndex a owl:DatatypeProperty ;
    rdfs:label "has server index" ;
    rdfs:domain opcua:OpcUaAccess ;
    rdfs:range xsd:integer ;
    rdfs:comment "The server index used in expanded node IDs." .

opcua:hasNamespaceURI a owl:DatatypeProperty ;
    rdfs:label "has namespace URI" ;
    rdfs:domain opcua:OpcUaAccess ;
    rdfs:range xsd:anyURI ;
    rdfs:comment "The URI of the namespace used in expanded node IDs." .

opcua:hasNamespaceIndex a owl:DatatypeProperty ;
    rdfs:label "has namespace index" ;
    rdfs:domain opcua:OpcUaAccess ;
    rdfs:range xsd:integer ;
    rdfs:comment "The namespace index used in node IDs." .
    
opcua:hasIdentifier a owl:DatatypeProperty ;
    rdfs:label "has identifier" ;
    rdfs:domain opcua:OpcUaAccess ;
    rdfs:range rdfs:Literal ;
    rdfs:comment "The identifier used in node IDs." .

opcua:hasOpcUaConnectionInfo a owl:ObjectProperty ;
    rdfs:label "has OPC UA connection information" ;
    rdfs:domain opcua:OpcUaAccess ;
    rdfs:range opcua:OpcUaConnectionInfo ;
    owl:inverseOf opcua:isOpcUaConnectionInfoOf ;
    rdfs:comment "Links connection information to OPC UA Access requiring it." .

opcua:isOpcUaConnectionInfoOf a owl:ObjectProperty ;
    rdfs:label "is OPC UA connection information of" ;
    rdfs:domain opcua:OpcUaConnectionInfo ;
    rdfs:range opcua:OpcUaAccess ;
    owl:inverseOf opcua:hasOpcUaConnectionInfo ;
    rdfs:comment "Links OPC UA Access to connection information required by it." .

opcua:hasMessageSecurity a owl:ObjectProperty ;
    rdfs:label "has message security" ;
    rdfs:domain opcua:OpcUaConnectionInfo ;
    rdfs:range opcua:MessageSecurity ;
    owl:inverseOf opcua:isMessageSecurityOf ;
    rdfs:comment "Links MessageSecurity to OpcUaConnectionInfo requiring it for secure communication." .

opcua:isMessageSecurityOf a owl:ObjectProperty ;
    rdfs:label "is message security of" ;
    rdfs:domain opcua:MessageSecurity ;
    rdfs:range opcua:OpcUaConnectionInfo ;
    owl:inverseOf opcua:hasMessageSecurity ;
    rdfs:comment "Links OpcUaConnectionInfo to MessageSecurity required by it for secure communication." .

opcua:hasSecurityPolicy a owl:DatatypeProperty ;
    rdfs:label "has security policy" ;
    rdfs:domain opcua:MessageSecurity ;
    rdfs:range xsd:string ;
    rdfs:comment "The name of the security policy profile defining the cryptographic algorithms for OPC UA message security." .

opcua:hasMode a owl:DatatypeProperty ;
    rdfs:label "has mode" ;
    rdfs:comment "A enumeration that defines the message security mode." ;
    rdfs:domain opcua:MessageSecurity ;
    rdfs:range [ a rdfs:Datatype ;
            owl:oneOf [ a rdf:List ;
                    rdf:first "Sign"^^opcua:mode ;
                    rdf:rest [ a rdf:List ;
                            rdf:first "SignAndEncrypt"^^opcua:mode ;
                            rdf:rest () ] ] ] .

opcua:hasServerCert a owl:DatatypeProperty ;
    rdfs:label "has server certificate" ;
    rdfs:domain opcua:MessageSecurity ;
    rdfs:range xsd:anyURI ;
    rdfs:comment "The server certificate used to establish an OPC UA secure channel." .

opcua:hasClientCert a owl:DatatypeProperty ;
    rdfs:label "has client certificate" ;
    rdfs:domain opcua:MessageSecurity ;
    rdfs:range xsd:anyURI ;
    rdfs:comment "The client certificate used to establish an OPC UA secure channel." .

opcua:hasClientPrivateKey a owl:DatatypeProperty ;
    rdfs:label "has client private key" ;
    rdfs:domain opcua:MessageSecurity ;
    rdfs:range xsd:anyURI ;
    rdfs:comment "The client's private key used to establish an OPC UA secure channel." .

# ---------------------------------------------------
# InfluxDB Classes
# ---------------------------------------------------

influxdb:InfluxDbAccess a owl:Class ;
    rdfs:label "Influx Db Access" ;
    rdfs:subClassOf core:DataAccess ;
    rdfs:comment "Contains the information used to query InfluxDB points." .

influxdb:InfluxDbConnectionInfo a owl:Class ;
    rdfs:label "Influx Db Connection Info" ;
    rdfs:subClassOf core:ConnectionInfo ;
    rdfs:comment "Contains the information required to connect to an InfluxDB server." .

influxdb:Tag a owl:Class ;
    rdfs:label "Tag" ;
    rdfs:subClassOf core:KeyValuePair ;
    rdfs:comment "A key-value pair used to query points in InfluxDB." .

# ---------------------------------------------------
# InfluxDB Properties
# ---------------------------------------------------

influxdb:hasMeasurement a owl:DatatypeProperty ;
    rdfs:label "has measurement" ;
    rdfs:domain influxdb:InfluxDbAccess ;
    rdfs:range xsd:string ;
    rdfs:comment "The measurement name in InfluxDB." .

influxdb:hasField a owl:DatatypeProperty ;
    rdfs:label "has field" ;
    rdfs:domain influxdb:InfluxDbAccess ;
    rdfs:range xsd:string ;
    rdfs:comment "The field key in InfluxDB." .

influxdb:hasTag a owl:ObjectProperty ;
    rdfs:label "has tag" ;
    rdfs:domain influxdb:InfluxDbAccess ;
    rdfs:range influxdb:Tag ;
    owl:inverseOf influxdb:isTagOf ;
    rdfs:comment "Links a Tag identifying a point to InfluxDB Access." .

influxdb:isTagOf a owl:ObjectProperty ;
    rdfs:label "is tag of" ;
    rdfs:domain influxdb:Tag ;
    rdfs:range influxdb:InfluxDbAccess ;
    owl:inverseOf influxdb:hasTag ;
    rdfs:comment "Links InfluxDB Access to a Tag identifying a point." .

influxdb:hasInfluxDbConnectionInfo a owl:ObjectProperty ;
    rdfs:label "has InfluxDB connection information" ;
    rdfs:domain influxdb:InfluxDbAccess ;
    rdfs:range influxdb:InfluxDbConnectionInfo ;
    owl:inverseOf influxdb:isInfluxDbConnectionInfoOf ;
    rdfs:comment "Links connection information to InfluxDB Access requiring it." .

influxdb:isInfluxDbConnectionInfoOf a owl:ObjectProperty ;
    rdfs:label "is InfluxDB connection information of" ;
    rdfs:domain influxdb:InfluxDbConnectionInfo ;
    rdfs:range influxdb:InfluxDbAccess ;
    owl:inverseOf influxdb:hasInfluxDbConnectionInfo ;
    rdfs:comment "Links InfluxDB Access to connection information required by it." .

influxdb:hasBucket a owl:DatatypeProperty ;
    rdfs:label "has bucket" ;
    rdfs:domain influxdb:InfluxDbConnectionInfo ;
    rdfs:range xsd:string ;
    rdfs:comment "The bucket name in InfluxDB." .

influxdb:hasOrganization a owl:DatatypeProperty ;
    rdfs:label "has organization" ;
    rdfs:domain influxdb:InfluxDbConnectionInfo ;
    rdfs:range xsd:string ;
    rdfs:comment "The organization name in InfluxDB." .