@prefix iop: <https://w3id.org/iadopt/ont/> .
@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
@prefix skos: <http://www.w3.org/2004/02/skos/core#> .
@prefix ex: <http://example.org/iadopt/challenge/> .

ex:CO2
    a 
        iop:Variable ;
    rdfs:label 
        "Carbon dioxide amount fraction" ;
    iop:hasObjectOfInterest 
        _:b1 ;
    iop:hasProperty 
        <https://vocab.nerc.ac.uk/collection/S06/current/S0600073/> .

_:b1
    a 
        iop:Entity ,
        iop:AsymmetricSystem ;
    iop:hasDenominator 
        <http://vocab.nerc.ac.uk/collection/P21/current/MS292/> ;
    iop:hasNumerator 
        <https://vocab.nerc.ac.uk/collection/S27/current/CS003089/> .

<https://vocab.nerc.ac.uk/collection/S06/current/S0600073/>
    a 
        iop:Property ;
    rdfs:label 
        "mole fraction" .

<http://vocab.nerc.ac.uk/collection/P21/current/MS292/>
    a 
        iop:Entity ;
    rdfs:label 
        "air" .

<https://vocab.nerc.ac.uk/collection/S27/current/CS003089/>
    a 
        iop:Entity ;
    rdfs:label 
        "carbon dioxide" .