+L0 = <http://www.simantics.org/Layer0-1.1>\r
+STR = <http://www.simantics.org/Structural-1.2>\r
+DIA = <http://www.simantics.org/Diagram-2.2>\r
+\r
+//// CONNECTION BRANCHING / ROUTING\r
+\r
+DIA.HasInverseAttachment <R L0.IsRelatedTo : L0.FunctionalRelation\r
+ @L0.symmetric\r
+ L0.HasDescription "Identifies the inversely directed connector attachment relation of a DIA.HasConnector relation. For example, DIA.HasPlainConnector is the inverse attachment relation of DIA.HasArrowConnector."\r
+\r
+DIA.HasConnector <R STR.IsConnectedTo <R L0.IsComposedOf\r
+ L0.InverseOf DIA.IsConnectorOf\r
+ L0.HasDomain DIA.Connection\r
+ --> DIA.Connector\r
+DIA.HasTailConnector <R DIA.HasConnector\r
+ L0.HasDescription "Identifies, where applicable, the beginning of the connection"\r
+ L0.InverseOf DIA.IsTailConnectorOf\r
+DIA.HasHeadConnector <R DIA.HasConnector\r
+ L0.HasDescription "Identifies, where applicable, the end of the connection"\r
+ L0.InverseOf DIA.IsHeadConnectorOf\r
+ DIA.HasInverseAttachment DIA.HasTailConnector\r
+DIA.HasPlainConnector <R DIA.HasTailConnector\r
+ L0.HasDescription "Identifies a connection end where no arrowhead is drawn."\r
+ L0.InverseOf DIA.IsPlainConnectorOf\r
+DIA.HasArrowConnector <R DIA.HasHeadConnector\r
+ L0.HasDescription "Identifies a connection end with an arrow."\r
+ L0.InverseOf DIA.IsArrowConnectorOf\r
+ DIA.HasInverseAttachment DIA.HasPlainConnector\r
+DIA.HasBranchPoint <R DIA.HasInteriorRouteNode\r
+ L0.InverseOf DIA.IsBranchPointOf\r
+ L0.HasDomain DIA.Connection\r
+ --> DIA.BranchPoint\r
+DIA.AreConnected <R L0.IsWeaklyRelatedTo\r
+ @L0.symmetric\r
+ // TODO L0.HasDomain DIA.Connector or DIA.BranchPoint\r
+ // TODO --> DIA.Connector or DIA.BranchPoint\r
+\r
+DIA.Connector <T STR.Connection : L0.Type\r
+// HN: removed, cannot be valid requirements\r
+ @L0.property DIA.AreConnected\r
+ @L0.property STR.Connects\r
+\r
+DIA.Connection <T DIA.Element : L0.Type\r
+ >-- DIA.HasTransform\r
+ @L0.property DIA.HasPlainConnector\r
+ @L0.property DIA.HasArrowConnector\r
+ @L0.property DIA.HasBranchPoint\r
+ @L0.property STR.HasConnectionType\r
+ @L0.property DIA.Routing\r
+\r
+DIA.BranchPoint <T DIA.InteriorRouteNode\r
+ @L0.property DIA.Horizontal\r
+ @L0.property DIA.Vertical\r
+ @L0.property DIA.AreConnected\r
+\r
+DIA.Horizontal\r
+ @L0.defTag \r
+DIA.Vertical\r
+ @L0.defTag\r
+\r
+DIA.RoutingRelation : L0.Relation\r
+DIA.Routing : DIA.RoutingRelation\r
+ @L0.tag L0.Abstract\r
+ @L0.defTag\r
+ L0.HasDescription "A relation meant to be inherited to create specific tags describing how a connection should be routed. The relation itself should be made adaptable to a routing strategy class org.simantics.g2d.routing.IRouter2. A connection can only have 0 to 1 Routing tags."\r
+DIA.LinearRouting <R DIA.Routing\r
+ @L0.symmetric\r
+ L0.HasLabel "Straight"\r
+ L0.HasDescription "Connection line segments will be routed with straight lines between terminals, route points and branch points."\r
+DIA.RightAngledRouting <R DIA.Routing\r
+ @L0.symmetric\r
+ L0.HasLabel "Right-angled"\r
+ L0.HasDescription "Connection line segments will be routed with x/y axis-aligned right-angled lines between so that the connection will is guaranteed to pass through each route and branch point."\r
+\r
+DIA.HasDefaultRouting <R L0.IsRelatedTo\r
+ L0.HasDomain STR.ConnectionType\r
+ --> DIA.RoutingRelation\r
+\r
+// NOTE: attach the diagram ontology default attachment relation to default structural modelling rules.\r
+STR.DefaultModelingRules\r
+ STR.HasAttachmentRelation DIA.HasPlainConnector\r