Propertychain. Thepropertychainpatternenablesconnectionbetweenindividualsoftwodifferentclassesbylinking theclasses viamediatingclasses, whichareimplementedas OWL allValuesFrom restrictions. Everymediatorclassis specifiedasasubclassofanOWLallValuesFromrestrictionthatindicatesthenextclassinthechainusinganOP.The linkedclassisalsoasubclassofanOWLallValuesFromrestriction. Forinstance,inaninteriordesignsystem,aroom includes only objects, which are made of natural materials.