querybuilder question

[Andy Seaborne]

how do I add

OPTIONAL {
    ?s <q> 123 .
    ?s <v> ?x .
    FILTER(?x>56)
}
i.e a compound OPTIONAL pattern?

There seems to be no concept of a group pattern (do not confuse with 
GROUP BY).

(This applies all places group patterns occur, which is quite a few in 
SPARQL)

        Andy