extension.ttl

@prefix bacnet: <http://data.ashrae.org/bacnet/2020#> .
@prefix brick: <https://brickschema.org/schema/Brick#> .
@prefix bsh: <https://brickschema.org/schema/BrickShape#> .
@prefix dcterms1: <http://purl.org/dc/terms#> .
@prefix owl: <http://www.w3.org/2002/07/owl#> .
@prefix qudt: <http://qudt.org/schema/qudt/> .
@prefix qudtqk: <http://qudt.org/vocab/quantitykind/> .
@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
@prefix ref: <https://brickschema.org/schema/Brick/ref#> .
@prefix s223: <http://data.ashrae.org/standard223#> .
@prefix sdo: <http://schema.org/> .
@prefix sh: <http://www.w3.org/ns/shacl#> .
@prefix skos: <http://www.w3.org/2004/02/skos/core#> .
@prefix sosa: <http://www.w3.org/ns/sosa/> .
@prefix tag: <https://brickschema.org/schema/BrickTag#> .
@prefix unit: <http://qudt.org/vocab/unit/> .
@prefix vcard: <http://www.w3.org/2006/vcard/ns#> .
@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .
@prefix ext: <urn:my-extension#> .
@prefix bldg: <urn:my-building#> .

# extension class definitions

ext:InterfacePanel a owl:Class ;
    skos:definition "A panel that provides an interface for user input" ;
    # TODO: probably shoudl be subclass of brick:Device or IT_Device
    rdfs:subClassOf brick:Entity ;
.

ext:User_Rating_Sensor a owl:Class ;
    rdfs:subClassOf brick:Sensor ;
.

model.ttl

@prefix bacnet: <http://data.ashrae.org/bacnet/2020#> .
@prefix brick: <https://brickschema.org/schema/Brick#> .
@prefix bsh: <https://brickschema.org/schema/BrickShape#> .
@prefix dcterms1: <http://purl.org/dc/terms#> .
@prefix owl: <http://www.w3.org/2002/07/owl#> .
@prefix qudt: <http://qudt.org/schema/qudt/> .
@prefix qudtqk: <http://qudt.org/vocab/quantitykind/> .
@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
@prefix ref: <https://brickschema.org/schema/Brick/ref#> .
@prefix s223: <http://data.ashrae.org/standard223#> .
@prefix sdo: <http://schema.org/> .
@prefix sh: <http://www.w3.org/ns/shacl#> .
@prefix skos: <http://www.w3.org/2004/02/skos/core#> .
@prefix sosa: <http://www.w3.org/ns/sosa/> .
@prefix tag: <https://brickschema.org/schema/BrickTag#> .
@prefix unit: <http://qudt.org/vocab/unit/> .
@prefix vcard: <http://www.w3.org/2006/vcard/ns#> .
@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .
@prefix ext: <urn:my-extension#> .
@prefix bldg: <urn:my-building#> .

# model

bldg:room1 a brick:Bathroom ;
    rdfs:label "Bathroom" ;
    brick:hasPoint bldg:ammonia1 ;
    brick:isLocationOf bldg:interface_panel1 ;
.

bldg:ammonia1 a brick:Ammonia_Sensor ;
    ref:hasExternalRepresentation [
        ref:hasTimeseriesId "c3298e46-7546-4119-9418-799e14a249a7" ;
        ref:storedAt "postgres://user:pass@host:port/db" ;
    ] ;
    ref:hasExternalRepresentation [ # TODO: not defined yet
        ref:hasMQTTTopic "room1/amonia1" ;
    ] ;
    ref:hasExternalRepresentation [ # TODO: not defined yet
        # rest endpoint
        ref:hasRESTEndpoint "https://my.cloud.ammonia/" ;
        # openapi spec
        ref:hasSchema "path/to/schema.json" ;
    ] ;
.

bldg:interface_panel1 a ext:InterfacePanel ;
    brick:hasPoint bldg:user_rating_sensor1, bldg:battery_status_1 ;
.

bldg:user_rating_sensor1 a ext:User_Rating_Sensor ;
    ref:hasExternalRepresentation [
        ref:hasTimeseriesId "0612b973-c71e-4e8c-acd3-37c6556261ac" ;
        ref:storedAt "postgres://user:pass@host:port/db" ;
    ] ;
.

bldg:battery_status_1 a brick:Battery_Voltage_Sensor ;
    ref:hasExternalRepresentation [
        ref:hasTimeseriesId "20fcbc8b-93fb-4696-ba9d-f0d9df67d2a5" ;
        ref:storedAt "postgres://user:pass@host:port/db" ;
    ] ;
.

test.py

import brickschema

g = brickschema.Graph()
g.load_file("https://sparql.gtf.fyi/ttl/Brick1.3rc1.ttl")
g.load_file("model.ttl")
g.load_file("extension.ttl")

res = g.query("""SELECT ?bat ?interface ?room WHERE {
  ?room a brick:Bathroom .
  ?room brick:isLocationOf ?interface .
  ?interface brick:hasPoint ?bat .
  ?bat a brick:Battery_Voltage_Sensor .
}""")
for row in res:
    print(row)