Stephen Allen created JENA-697:
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Summary: Property Function to Split a String into Multiple Bindings
Key: JENA-697
URL: https://issues.apache.org/jira/browse/JENA-697
Project: Apache Jena
Issue Type: New Feature
Reporter: Stephen Allen
Assignee: Stephen Allen
Priority: Minor
It would be really useful to have a property function that could take a string,
split it on some delineator and then return each token as a new binding.
One example where it is useful is if you have some entities with keywords as
concatenated literal strings. It would be nice to extract them and perform
some operation:
{code}
prefix : <http://example.org>
prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#>
insert data {
:a :keywords "report data important expensive" .
:b :keywords "data earthquake report" .
}
{code}
Then query with:
{code}
prefix : <http://example.org>
prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#>
prefix apf: <http://jena.hpl.hp.com/ARQ/property#>
select ?keyword (count(*) as ?c)
where {
?s :keywords ?text .
?keyword apf:strSplit (?text " ")
}
group by ?keyword
order by desc(?c) ?keyword
{code}
Results:
{code}
--------------------
| keyword | c |
====================
| "data" | 2 |
| "report" | 2 |
| "earthquake" | 1 |
| "expensive" | 1 |
| "important" | 1 |
--------------------
{code}
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