Closed yayamamo closed 3 years ago
I'll add some docs, but in general, you can call RDF::Query->add_function
to register a function before the endpoint is started (e.g. at the top of the included endpoint.psgi):
RDF::Query->add_function( 'http://example.org/upper', sub {
my $query = shift;
my $node = shift;
my $value = $node->value;
return RDF::Query::Node::Literal->new(uc($value));
} );
and use it like this:
PREFIX ex: <http://example.org/>
SELECT * {
BIND(ex:upper("hello") AS ?x)
}
Thank you. I confirmed my customized function works.
Could you add a document that explains how we can register our own function if it is not difficult? For example, a special predicate to bind results of a function I code to a variable ( e.g. BIND(my:function(?x, ?y) AS ?z) ).