Uploaded example 31 from the manual

Example31_Aspect_Oriented_Paradigm.mp

+/* Example31_Aspect_Oriented_Paradigm.mp
+
+	The COORDINATE operation supports a “cause-effect” refinement for
+the behavior of two components and it bears a certain similarity
+to Aspect-Oriented Programming (AOP) paradigm [Kiczales et al. 1997]
+(or read https://en.wikipedia.org/wiki/Aspect-oriented_programming).
+For example, the following AOP pattern could be modeled by MP schema
+where event coordination implements AOP join point and advice
+coordination.
+
+	Suppose that the main stream of execution contains calls to
+methods M1 and M2 as join points, and the aspect behavior requires
+a call to Prolog before, and to Epilog after each method call as an
+advice. The corresponding MP model may look like the following.
+
+*/
+
+SCHEMA Aspect_Oriented_Paradigm
+
+ROOT Main: (* ( M1 | M2 | do_something_else ) *);
+ROOT PreAdvice: (* Prolog *);
+ROOT PostAdvice: (* Epilog *);
+
+COORDINATE
+	$jp: ( M1 | M2 ) FROM Main,
+	$a1: Prolog FROM PreAdvice,
+	$a2: Epilog FROM PostAdvice
+
+DO ADD
+	$a1 PRECEDES $jp,
+	$jp PRECEDES $a2;
+OD;
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