Hercules RDF Library in JavaScript: SPARQL Engine Demo

Hercules is a library in JavaScript for handling RDF graph and queries.

In this demonstaration, you can query in SPARQL Query Language against a RDF graph in turtle format.

Status

This demonstarion is using the first beta release version. It is still unstable.

Current version

0.1.1

Supporting platform

• Mozilla Firefox 2.0+
• Microsoft Internet Explorer 6.0+ (7.x is not confirmed)
• Opera 9.5
• Mozilla Spidermonkey 1.8

Note: Opera 9.2x is not supported.

Known issues

• GRAPH is not supported yet. Use HttpXmlRequest?
• OPTIONAL is not supported yet. Comming soon.
• Numeric literals are not supported yet. Implementing "lexical-value-mapping" of the build-in XSD datatypes now.
• FILTER is not suppoted yet, will be implemented after the datatypes issue.

Download

If need, you can download hercules via the following temporary link (URL will be changed soon).

• hercules-0.1.1.tar.gz

Currently, we release "compiled" sources only. The source file contained in the above archive was automatically generated by a post-processor. It may be bad to read.

Demo

RDF Graph in Turtle

@prefix foaf: <http://xmlns.com/foaf/0.1/> . _:a foaf:name "Johnny Lee Outlaw" . _:a foaf:mbox <mailto:jlow@example.com> . _:b foaf:name "Peter Goodguy" . _:b foaf:mbox <mailto:peter@example.org> . _:c foaf:mbox <mailto:carol@example.org> .

SPARQL Query

PREFIX foaf: <http://xmlns.com/foaf/0.1/> SELECT ?name ?mbox WHERE { ?x foaf:name ?name . ?x foaf:mbox ?mbox . }

Result