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In RGG

Custom patterns can be created in RGG with the simple syntax:

// declaration
class patternName(@In Node a, @Out Node b) (
    // some patterns
    )

- context - in and out - combining

Examples

// declaration
class xyzPath(@In Node a, @Out Node b) (
    a -x-> -y-> -z-> b
    )
 
//usage
void rule() [ Node -xyzPath-> Node ==>; ]