This is based on the same technique used to compute the position of an element in an RDF list using SPARQL that is described in: Is it possible to get the position of an element in an RDF Collection in SPARQL? If you have data like this: @prefix : <http://example.org> . :orgA :hasSuborganization :orgB, :orgC, … Read more
A Pure SPARQL 1.1 Solution I’ve extended the data to make the problem a little harder. Let’s add a duplicate element to the list, e.g., an additional :a at the end: @prefix : <http://example.org#> . :ls :list (:a :b :c :a) . Then we can use a query like this to extract each list node … Read more
You can GROUP BY by the variables that identify the tweet and then use GROUP_CONCAT to concatenate the hashtags into something like an array, but it will still be a string that you’ll need to parse afterward. For instance, given data like @prefix smo: <http://example.org/> . @prefix : <http://example.org/> . :tweet1 smo:tweeted_at “1” ; smo:has_hashtag … Read more