title: Select multiple values as object in SPARQL pattern
body: <p>In SPARQL we can do something like this</p>
  
  <pre><code>select * where {
      ?s   (_:prop1 | _:prop2)  "some_val" .
      ...
      #use ?s in other patterns
      ?s    ?o    ?p .
  }
  </code></pre>
  
  <p>Is it possible to do the same for the object part of the pattern? And what are some workarounds of this in case it is not possible?</p>
  
  <p>For example:</p>
  
  <pre><code>select * where {
      ?s   _:prop ("v1" | "v2") .
      ...
      #use ?s in other patterns
      ?s    ?o    ?p .
  }
  </code></pre>