select distinct predicate,value
  from sparql.get_properties('dbpedia','http://dbpedia.org/resource/Johann_Sebastian_Bach')
 where predicate = 'http://dbpedia.org/ontology/birthYear'
;
               predicate               | value 
---------------------------------------+-------
 http://dbpedia.org/ontology/birthYear | 1685
(1 row)

select substr(sparql.compile_query('dbpedia','bach',$$
select ?predicate, ?object
where {
 <http://dbpedia.org/resource/Johann_Sebastian_Bach> ?predicate ?object.
}
$$,'{predicate}'),1,31) as magick
;
             magick              
---------------------------------
 create or replace function bach
(1 row)

select * from bach where predicate='http://dbpedia.org/ontology/birthYear';
               predicate               | object 
---------------------------------------+--------
 http://dbpedia.org/ontology/birthYear | {1685}
(1 row)

;
with q as (
 values 
  ('http://purl.org/dc/elements/1.1/creator'),
  ('http://www.w3.org/2000/10/swap/pim/exif#apperture'),
  ('http://krneki.org/id') 
)
select sparql.iri_ident(column1) as ident,
       sparql.iri_prefix(column1) as prefix,
       sparql.iri_ns(column1) as ns,
       sparql.iri_crunch(column1) as crunch
  from q
;
   ident   |                  prefix                  |  ns  |        crunch        
-----------+------------------------------------------+------+----------------------
 creator   | http://purl.org/dc/elements/1.1/         | dc   | dc:creator
 apperture | http://www.w3.org/2000/10/swap/pim/exif# | exif | exif:apperture
 id        | http://krneki.org/                       |      | http://krneki.org/id
(3 rows)