8.1 Discovery Queries

By using the oneM2M Base Ontology in the <semanticDescriptor> resources we can send queries to the oneM2M CSE to find the services offered by a device and further query those services to discover the oneM2M primitives to access those services.

Here is a list of queries that we will support for all three of the models:

Query 1: Find all washing machines of manufacturer XYZ.

PREFIX sn: <http://www.XYZ.com/WashingMachines#XYZ_Cool>
PREFIX m2m: <https://git.onem2m.org/MAS/BaseOntology/raw/master/base_ontology.owl#>
PREFIX saref: <https://saref.etsi.org/core/>

SELECT ?res ?wm
WHERE {
    ?wm a sn:XYZ_Cool .
    ?wm m2m:oneM2MTargetURI ?res .
}

This lists 3 washing machines

res	wm
"myWashingMachine"	http://www.XYZ.com/WashingMachines#XYZ_CoolWASH_XYZ_myWashingMachine
"My-WashingMachine"	http://www.XYZ.com/WashingMachines#XYZ_CoolWASH_XYZ_My-WashingMachine
"deviceClothesWasher"	http://www.XYZ.com/WashingMachines#XYZ_CoolWASH_XYZ_deviceClothesWasher

Query 2: List all the commands offered by a specific washing machine

PREFIX sn:<http://www.XYZ.com/WashingMachines#>
PREFIX m2m: <https://git.onem2m.org/MAS/BaseOntology/raw/master/base_ontology.owl#>
PREFIX saref: <https://saref.etsi.org/core/>
PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>

SELECT ?wm ?operation ?command
WHERE {
    ?wm m2m:hasOperation ?operation .
    ?operation a ?command .
    VALUES ?wm {<http://www.XYZ.com/WashingMachines#XYZ_CoolWASH_XYZ_myWashingMachine>} .
    ?command rdfs:subClassOf saref:Command
}

This lists the operations and commands and functions associated with the commands

wm	operation	command
http://www.XYZ.com/WashingMachines#XYZ_CoolWASH_XYZ_myWashingMachine	http://www.XYZ.com/WashingMachines#XYZ_CoolWASH_XYZ-StartStopFunction-ON_Command_myWashingMachine	saref:OnCommand
http://www.XYZ.com/WashingMachines#XYZ_CoolWASH_XYZ_myWashingMachine	http://www.XYZ.com/WashingMachines#XYZ_CoolWASH_XYZ-StartStopFunction-OFF_Command_myWashingMachine	saref:OffCommand
http://www.XYZ.com/WashingMachines#XYZ_CoolWASH_XYZ_myWashingMachine	http://www.XYZ.com/WashingMachines#XYZ_CoolWASH_XYZ-StartStopFunction-TOGGLE_Command_myWashingMachine	saref:ToggleCommand
http://www.XYZ.com/WashingMachines#XYZ_CoolWASH_XYZ_myWashingMachine	http://www.XYZ.com/WashingMachines#XYZ_CoolWASH_XYZ-MonitoringFunction-WashingMachineStatus_myWashingMachine	saref:GetCommand