> Have you seen the dynamic dataset feature?

Yes however how this works is with multiple FROM clauses, for example

SELECT ...
FROM <alice-foaf>
FROM <bob-foaf>
FROM <john-foaf>
FROM <mike-foaf>
...

which is very inconvenient if I've split my graph in multiple stores. For 
instance, wikidata would become

SELECT ...
FROM <wikidata-tdb1>
FROM <wikidata-tdb2>
FROM <wikidata-tdb3>
FROM <wikidata-tdb4>
...

what I was saying instead, is to define some kind of alias such that I can use

SELECT ... FROM <wikidata>

and internally Fuseki knows that I'm refering to <wikidata-tdb1> + 
<wikidata-tdb2> + <wikidata-tdb3> + <wikidata-tdb4> + ...

this would also be useful when using

SELECT ...
WHERE {
    GRAPH <wikidata> {
    }
}

Either this, or a way to declare a graph with multiple locations.

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