Ontology

The vocabulary for describing a SemBeacon is based on the Positioning System Ontology (POSO), an ontology that helps to describe a positioning system.

A documentation for the SemBeacon ontology can be found here.

Classes

`sembeacon:SemBeacon`

A SemBeacon sosa:FeatureOfInterest that is a subclass of poso:BluetoothBeacon. Optionally, users can use a beacon to desribe another resource using the rdfs:seeAlso predicate.

Data Properties

`sembeacon:instanceId`

The 4-byte instance ID as hexadecimal representation using xsd:hexBinary. This property should be added to a sembeacon:SemBeacon.

`sembeacon:namespaceId`

The 16-byte namespace ID as hexadecimal representation using xsd:hexBinary. This property should be added to a sembeacon:SemBeacon or a ssn:Deployment if linked using the object property sembeacon:namespace.

`sembeacon:shortResourceURI`

The short resource URI as xsd:anyURI. This is the shortened resource URI if available.

Object Properties

`sembeacon:namespace`

An optional namespace link to a deployment that has a sembeacon:namespaceId.

Semantic Flags

The semantic flags specified in the advertisement data need to indicate that data is available online.

Bit	Axiom
0	`poso:hasPosition` min 1 `poso:AbsolutePosition`
1	N.a.
2	N.a.
3	`poso:inDeployment` min 1 `ssn:Deployment`
4	`sosa:observes` min 1 `sosa:ObservableProperty`
5 - 7	Reserved for future use.

Example

@prefix :          <http://sembeacon.org/example.ttl#> .
@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 ssn:       <http://www.w3.org/ns/ssn/> .
@prefix ogc:       <http://www.opengis.net/ont/geosparql#> .
@prefix hardware:  <http://w3id.org/devops-infra/hardware#> .
@prefix poso:      <http://purl.org/poso/> .
@prefix posoc:     <http://purl.org/poso/common/> .
@prefix sembeacon: <http://purl.org/sembeacon/> .
@prefix qudt:      <http://qudt.org/schema/qudt/> .
@prefix unit:      <http://qudt.org/vocab/unit/> .

:building_a a ssn:Deployment ;
  rdfs:label "Building A" ;
  sembeacon:namespaceId "e19c5e1ed6a14d698b3115451c3add71"^^xsd:hexBinary .

:room_a1_2 a sembeacon:SemBeacon ;
  rdfs:label "SemBeacon Room A1.2"@en ;
  rdfs:isDefinedBy <http://sembeacon.org/example.ttl#> ;
  sembeacon:namespace :building_a ;
  sembeacon:instanceId "beac0101"^^xsd:hexBinary ;
  hardware:mac "00:11:22:33:44:55" ;
  posoc:referenceRSSI [ # Reference RSSI is a ...
    # ... factory calibrated signal strength
    poso:hasRSS [ qudt:unit unit:DeciB_M ; qudt:numericValue -56 ] ;
    # ... measured at a specific distance
    poso:hasRelativeDistance [ unit:Meter ; qudt:value "1.0"^^xsd:double ] .
  ] ;
  poso:hasPosition [ a poso:AbsolutePosition ;
    poso:hasAccuracy [ ] ;
    poso:xAxisValue [ ] ;
    poso:yAxisValue [ ] ;
    poso:zAxisValue [ ] ] .

:room_a1_3 a posoc:iBeacon ;
  rdfs:label "iBeacon Room A1.3"@en ;
  rdfs:isDefinedBy <http://sembeacon.org/example.ttl#> ;
  sembeacon:namespace :building_a ;
  hardware:mac "00:55:44:33:22:11" ;
  posoc:major 11115 ;
  posoc:minor 12015 ;
  posoc:referenceRSSI [ 
    poso:hasRSS [ qudt:unit unit:DeciB_M ; qudt:numericValue -56 ] ;
    poso:hasRelativeDistance [ unit:Meter ; qudt:value "1.0"^^xsd:double ] .
  ] ;
  poso:hasPosition [ a poso:AbsolutePosition ;
    poso:hasAccuracy [ ] ;
    poso:xAxisValue [ ] ;
    poso:yAxisValue [ ] ;
    poso:zAxisValue [ ] ] .