L0 = <http://www.simantics.org/Layer0-1.1>
L0X = <http://www.simantics.org/Layer0X-1.1>
STR = <http://www.simantics.org/Structural-1.2>

STR.Functions.connectionExtension : L0.Function
STR.Functions.computeExpression : L0.ExternalValue