standard library package CauseAndEffect {
	doc /* This package provides language-extension metadata for cause-effect modeling. */
	
	public import CausationConnections::*;
	private import ScalarValues::*;
	private import Metaobjects::SemanticMetadata;

	metadata def <cause> CauseMetadata :> SemanticMetadata {
		doc
		/*
		 * CauseMetadata identifies a usage as being a cause occurrence.
		 * It is intended to be used to tag the cause ends of a Multicausation.
		 */
		 
		ref :>> annotatedElement : SysML::Usage;
		ref :>> baseType = causes as SysML::Usage;
	}
	
	metadata def <effect> EffectMetadata :> SemanticMetadata {
		doc
		/*
		 * EffectMetadata identifies a usage as being an effect occurrence.
		 * It is intended to be used to tag the effect ends of a Multicausation.
		 */
		 
		ref :>> annotatedElement : SysML::Usage;
		ref :>> baseType = effects as SysML::Usage;
	}
	
	metadata def CausationMetadata {
		doc
		/*
		 * CausationMetadata allows for the specification of additional metadata about
		 * a cause-effect connection definition or usage.
		 */
		 
		ref :> annotatedElement : SysML::ConnectionDefinition;
		ref :> annotatedElement : SysML::ConnectionUsage;
		
		attribute isNecessary : Boolean default false {
			doc 
			/* 
			 * Whether all the causes are necessary for all the effects to occur.
			 * If this is false (the default), then some or all of the effects may 
			 * still have occurred even if some of the causes did not.
			 */
		}
		
		attribute isSufficient : Boolean default false {
			doc
			/*
			 * Whether the causes were sufficient for all the effects to occur.
			 * If this is false (the default), then it may be the case that some
			 * other occurrences were also necessary for some or all of the effects
			 * to have occurred.
			 */
		}
		
		attribute probability : Real[0..1] {
			doc /* The probability that the causes will actually result in effects occurring. */
		}	
	}
	
	metadata def <multicausation> MulticausationSemanticMetadata :> CausationMetadata, SemanticMetadata {
		doc
		/*
		 * MulticausationMetadata is SemanticMetadata for a Multicausation connection.
		 */
		 
		ref :>> baseType = multicausations meta SysML::Usage;
	}
	
	metadata def <causation> CausationSemanticMetadadata :> CausationMetadata, SemanticMetadata {
		doc
		/*
		 * CausationMetadata is SemanticMetadata for a Causation connection.
		 */
		 
		ref :>> baseType = causations meta SysML::Usage;
	}
}