I can confirm that, just had a chat at RDF4JUsers
<https://groups.google.com/forum/#%21topic/rdf4j-users/p-uqdjgGMHs>
where I was told that:
"In terms of getting the query to parse, why not just reorder the
BIND() to the front of the group? This is what blazegraph is doing
internally. "
So you guessed right (and we are going to treat those queries the same way).
Thanks and greetings,
Adrian
> Hi!
>
> On 1/14/17 9:23 AM, Adrian Bielefeldt wrote:
>> I was wondering if anybody could help me understand why (and how) this
>> query:
>>
>> SELECT DISTINCT ?item
>> WHERE
>> { ?tree0 wdt:P31 ?item . BIND (wd:Q146 AS ?tree0) }
>>
>> is being accepted by query.wikidata.org.
> Probably Blazegraph engine considers it analogous with the query having
> the bind in front, or maybe optimization reorders it.
>
>> At the moment we are parsing them using OpenRDF, which fails (as far
> as I can see understandably) at parsing this query.
>
> Well, the standard does say you can not use a variable in BIND that was
> previously used, and I guess OpenRDF parser chooses to be more strict
> than Blazegraph.
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