Ambiguity and 4.5 Aggregate Query (and screw case)

[[
4.5 Aggregate Query

It should be possible to specify two or more RDF graphs against which
a query shall be executed; that is, the result of an aggregate query
is the merge of the results of executing the query on each of two or
more graphs.
]]

This states that we perform the query on each of the (two or more)
graphs. My intuition is that we want to perform the query on the
aggregation of the graphs. For instance,

one:
bob knows joe.
joe eats rice.
bob knows jane.

two:
jane eats rice.
bob knows pat.
pat eats rice.

Q: bob knows X.
   X eats rice.

from one:
 X is joe.
from two:
 X is jane
aggregation of performing the query on each of one and two:
 X is joe.
 X is jane.

performing the query on the aggregation of each of one and two:
 X is joe.
 X is jane.
 X is pat.

Maybe this was already decided in favor of the former; I don't recall.
-- 
-eric

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