CL-SPARQL

SPARQL query builder for Common Lisp.

Syntax

(sparql (:select * :where (?x ?y ?z)))

 (sparql 
    (:select *
        :where (?x ?y ?z)
        :limit 20
        :offset 10))

Subqueries

(sparql 
    (:select *
        :where (?x ?y ?z)
            (:select *
                :where (?x ?y ?z)
                :limit 20
                :offset 10)
        :limit 20
        :offset 10))

URI syntax

Enable special URI syntax with (sparql:enable-uri-syntax).

After that, you can write uris like:

#u<rdf:type>

and you get the expanded uri:

#<PURI:URI http://www.w3.org/1999/02/22-rdf-syntax-ns#type>.

Use define-uri-prefix to define new uri prefixes expansions, like:

(define-uri-prefix rdf "http://www.w3.org/1999/02/22-rdf-syntax-ns#")
(define-uri-prefix xsd "http://www.w3.org/2001/XMLSchema#")
(define-uri-prefix ex "http://www.franz.com/things#")  
(define-uri-prefix rdfs "http://www.w3.org/2000/01/rdf-schema#")  
(define-uri-prefix fn "http://www.w3.org/2005/xpath-functions#") 
(define-uri-prefix err "http://www.w3.org/2005/xqt-errors#")  
(define-uri-prefix owl "http://www.w3.org/2002/07/owl#")  
(define-uri-prefix xs "http://www.w3.org/2001/XMLSchema#")

Those are already defined.

URI syntax in queries

(sparql
    (:select ?x ?v ?z
        :where (?x #u<rdf:type> #u<owl:Ontology>)
               (?y ?v ?w)
               (:optional (?x ?y ?z))
        :limit 20))

Implementation technique

I think the embedded domain specific language technique used is interesting. parser-combinators library is used, but, instead of using for parsing strings, it is used for parsing already read Lisp lists.

License

MIT