Cast literal to uri

Support
1

How can I cast a literal object value to a URI that I can use as a predicate value?

I tried this:

prefix ais: <http://AIS.org/>

select *
where {
  ?i a ais:AssignmentContext .
  ?i ais:physical_column_name ?l .
  ?i uri(fn:concat("ais:", ?l))
}

but got an error.
Thanks
phil

2

Hi Phil!

The function you are looking for is called iri().

Best,
Jess

3

In the larger context of your query, you need to use BIND in order to use the generated IRI as a predicate variable, e.g.:

BIND(iri(fn:concat("ais:", ?l)) AS ?pred)
?i ?pred ?obj
4

Thanks Jess, what do you use for the fn: prefix

5

I tried prefix fn: http://www.w3.org/2005/xpath-functions#concat
but got an internal server error.

6

http://www.w3.org/2005/xpath-functions# worked

7

CONCAT() is a builtin function so can also call it without any prefix just like you do with IRI()

8

Yes, that works nicely also.
Thanks

9

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