Listing 2: Syntax of the Streaming MASSIF DSL.

DSL -> NameSpace* EventDecl* RSPQL? EventDecl -> ‘NAMED EVENT’ EventName (AbstractEvent | ComplexEvent) AbstractEvent -> ‘AS’ DLDescription ComplexEvent -> ‘MATCH’ (Modifier)? EventPattern (Guard)? (IFClause)? EventPattern -> EventPattern EventOperator EventPattern|AbstractEvent|‘NOT’EventPattern IFClause -> ‘IF’ ‘{’ (‘EVENT’ AbstractEvent ‘{’ BGP ‘}’)* ‘}’ EventOperator -> ‘AND’ | ‘OR’| ‘SEQ’ Modifier -> ‘EVERY’ | ‘FIRST’ | ‘LAST’ Guard -> ‘WHITIN’ Num ‘(’ TIMEUNIT ‘)’ TIMEUNIT -> ‘s’ | ‘m’ | ‘h’ | ‘d’ EventName -> String Num -> [0-9]+ NameSpace -> SPARQL PREFIX SYNTAX DLDescription -> MANCHESTER SYNTAX BGP -> SPARQL BGP SYNTAX RSPQL -> RSP-QL SYNTAX