It appears as if accumulate does support only a single pattern CE as
source pattern, e.g.:

Number() from accumulate(
        Cheese(
                price : price
        ),
        sum( price )
)

Is it possible to have more than one pattern in the source pattern, e.g.:

Number() from accumulate(
        Cheese(
                price : price,
                type : type
        )
        Person(
                favouriteCheese == type,
                age > 30
        ),
        sum( price )
)

The same could be said for collect, but there the problem to specify
which item of a matching tuple is to be collected, but this could be
handled recreating collect via accumulate, e.g.:

Collection() from accumulate(
        cheese : Cheese(
                type : type
        )
        Person(
                favouriteCheese == type,
                age > 30
        ),
        collect( cheese )
)

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