_:b2712231	<http://www.w3.org/2002/07/owl#onProperty>	<http://www.w3.org/ns/sosa/observedProperty> .
_:b2712231	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/2002/07/owl#Restriction> .
_:b2712231	<http://www.w3.org/2002/07/owl#hasValue>	<http://w3id.org/glosis/model/layerhorizon/structureGradeProperty> .