@prefix rdf:  <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
@prefix time: <http://www.w3.org/2006/time#>.
@prefix sosa: <http://www.w3.org/ns/sosa/> .
@prefix xsd:  <http://www.w3.org/2001/XMLSchema#> .
@prefix geo: <http://www.w3.org/2003/01/geo/wgs84_pos#>.
@base <http://example.org/data/> .


# The CO2 level observed in an ice core is 240 parts per million.
# the ice core is a sample of the polar ice sheet of Antarctica. 

<http://dbpedia.org/resource/Antarctic_ice_sheet> a sosa:FeatureOfInterest ;
  sosa:hasSample <iceCore/12>, <iceCore/13>, <iceCore/14> .

<iceCore/12> rdf:type sosa:Sample ;
  sosa:isSampleOf <http://dbpedia.org/resource/Antarctic_ice_sheet> ;
  sosa:isResultOf <WellDrilling/4578> ;
  sosa:madeBySampler <thermalDrill/2> .

  <WellDrilling/4578> a sosa:Sampling ;
    geo:lat -73.35 ; 
    geo:long 9.32 ;
    sosa:hasResult <iceCore/12> ;
    sosa:madeBySampler <thermalDrill/2> ;
    sosa:resultTime "2017-04-03T11:12:00Z"^^xsd:dateTime ;
    sosa:hasFeatureOfInterest <http://dbpedia.org/resource/Antarctic_ice_sheet> .

<iceCore/12#observation> a sosa:Observation ;
  sosa:observedProperty <iceCore/12#CO2> ;
  sosa:hasSimpleResult 240 .