«OCL»<br/>{geogenicConstraint : /*The attributes layerGenesisProcess, layerGenesisEnvironment, layerGenesisProcessState and layerRockType are only needed when layerType is of the value 'geogenic'*/<br/><br/>inv: self.layerType = LayerTypeValue::geogenic implies (self.layerGenisisEnvironment.isNotEmpty() and self.layerGenisisProcess.isNotEmpty() and self.layerRockType.isNotEmpty() and layerGenesisProcessState.isNotEmpty())<br/>}<br/>