Parliament implements the Jena graph interface. Query access to the indexes is provided via ARQ property functions. Data is added to the indexes via a mechanism that wraps a Jena GraphListeners In fact, our indexes should be work on non-Parliament graphs, although we do some query optimization that relies on information provided by our Parliament graph.
-rob On Sep 13, 2011, at 11:34 AM, Marco Neumann wrote: > I've organized a session with Dave Kolas at MIT/ W3C [1] earlier this > year and Parliament looks indeed great, it already uses PostGIS for > the spatial queries. I am not sure how Parliament relates to the Jena > API though. > > [1] http://www.vimeo.com/23850413 > > > On Tue, Sep 13, 2011 at 11:28 AM, Rob Battle <[email protected]> wrote: >> Hi, >> >> As Dave mentioned, Parliament [1] supports geospatial and temporal indexing. >> We index data using the geo-owl ontologies [2] for geospatial data and OWL >> time [3] for temporal data (although only ProperIntervals and >> DateTimeIntervals are supported, not DateTimeInstants). The spatial index >> supports predicates corresponding to RCC-8 and OGC simple features as >> property functions and can use PostGIS or a memory-mapped r-tree as an index. >> >> If you are interested, Parliament also has preliminary support for the >> proposed OGC GeoSPARQL [4] standard for geospatial queries over RDF (note >> that this is different from http://www.geosparql.org). >> We also have an unpublished article [5] which describes GeoSPARQL, evaluates >> some existing research/implementations in the geospatial semantic web, and >> describes the GeoSPARQL implementation in Parliament. >> >> The Parliament geosparql branch is located at [6] >> >> -rob >> >> [1] http://parliament.semwebcentral.org >> [2] http://www.w3.org/2005/Incubator/geo/XGR-geo/#owl >> [3] http://www.w3.org/TR/owl-time/ >> [4] http://portal.opengeospatial.org/files/?artifact_id=44722 >> [5] >> http://semwebcentral.org/scm/viewvc.php/*checkout*/branches/geosparql/paper/swjarticle.pdf?root=parliament >> [6] https://projects.semwebcentral.org/svn/parliament/branches/geosparql >> (username/password anonsvn) >> >> On Sep 13, 2011, at 8:17 AM, Dave Reynolds wrote: >> >>> There is also Parliament [1] which offers both geospatial and temporal >>> indexing graphs. >>> >>> Dave >>> >>> [1] http://parliament.semwebcentral.org/ >>> >>> >>> On Tue, 2011-09-13 at 13:08 +0100, Paolo Castagna wrote: >>>> Hi Alex, >>>> great to hear that, you are welcome. >>>> >>>> Something similar using Lucene Spatial capabilities instead of >>>> a proper GIS is here (it's just a less than two days hack): >>>> https://github.com/castagna/GeoARQ >>>> >>>> I was planning to post something along the lines of "making >>>> easier to plug LARQ or similar into ARQ", but unfortunately I do >>>> not a good idea (yet). >>>> >>>> It would be good to enable third parties to add their own property >>>> functions (that's possible) which use custom indexes and need to >>>> update those indexes as triples/quads are added/removed to the >>>> underlying RDF store. >>>> >>>> More on this later, in the meantime: welcome. >>>> >>>> Paolo >>>> >>>> Alexander Dutton wrote: >>>>> -----BEGIN PGP SIGNED MESSAGE----- >>>>> Hash: SHA1 >>>>> >>>>> Hi all, >>>>> >>>>> We've currently got a lot of (simple) geospatial data in >>>>> <http://data.clarosnet.org/> (served behind the scenes by Fuseki). >>>>> >>>>> We'd like to do some geospatial indexing magic, and were wondering >>>>> about writing something a bit like LARQ that will pull out things like >>>>> geo:Points and WKT literals, place them in a PostGIS-flavoured DB, and >>>>> then implements something like GeoSPARQL (<http://geosparql.org/>). >>>>> >>>>> Has anyone started doing this or something similar? I'm happy to give >>>>> it a go and I'm sure my employer would be happy to contribute it back >>>>> to Jena and the ASF. My plan was to go through the LARQ codebase to >>>>> work out how it hooks itself in, and use that as a model. >>>>> >>>>> Yours, >>>>> >>>>> Alex >>>>> >>>>> - -- >>>>> Alexander Dutton >>>>> Metamorphoses Project Developer, Claros >>>>> Oxford University Computing Services, ℡ 01865 (6)13483 >>>>> -----BEGIN PGP SIGNATURE----- >>>>> Version: GnuPG v1.4.11 (GNU/Linux) >>>>> Comment: Using GnuPG with Fedora - http://enigmail.mozdev.org/ >>>>> >>>>> iEYEARECAAYFAk5vQbgACgkQS0pRIabRbjC9QACfTZtTcFIhDXjWPR+MpEWunKkt >>>>> 38oAnR5n+oi1nuTZAfRdOrF2mcOac2Ck >>>>> =r1dj >>>>> -----END PGP SIGNATURE----- >>>>> >>>> >>> >>> >>> >> >> > > > > -- > Marco Neumann > KONA > > --- > Join us at the Semantic Web Media Summit in New York City for an > exciting event on 14 September 2011 > http://www.lotico.com/evt/swmsNYC2011/
