Racket Package rdf-core

This is the core data model for RDF in Racket, it also includes core vocabularies (such as rdf, rdfs, xml, and xsd) as well as some basic IO functions. The goal of this package is to provide the model allowing the user to create statements, graphs and datasets in-memory. Additional Racket packages provide capabilities layered on top of this such as support for OWL and SPARQL and additional vocabularies.

Example

The following shows the construction of a default (unnamed) graph with a simple set of statements. This is followed by a simple query pattern to return the first names of each subject.

(define my-graph
        (make-default-graph
          (let ((ns (make-namespace "http://example.com/peeps" "xp"))
            (append
              (make-statement-list
                (namespace-make-url ns "spongebob")
                '(("http://example.com/v/people#hasFirstName" ("Spongebob"))
                  ("http://example.com/v/people#hasLastName" ("Squarepants"))
                  ("http://example.com/v/people#hasAge" (19))
                  ("http://example.com/v/people#hasScores" (2 4 6))))
              (make-statement-list
                (namespace-make-url ns "patrick")
                '(("http://example.com/v/people#hasFirstName" ("Patrick"))
                  ("http://example.com/v/people#hasLastName" ("Star"))
                  ("http://example.com/v/people#hasAge" (19))
                  ("http://example.com/v/people#hasScores" (1 1 0)))))))))

(define get-first-names
        (query-pattern
          (make-statement-pattern
            (ignore)
            (match-value (namespace-make-url ns "hasFirstName"))
            (return-variable "name"))))

(println (graph-query my-graph get-first-names))
;; => '((("name" . "Spongebob")) (("name" . "Patrick")))

Changes

Version 0.1.0

• Initial version with very little documentation..