Rob Battle wrote:
It is open sourced under the BSD License
Hi Rob,
do you have a list of Parliament dependencies (in relation to the geospatial
capabilities) and their licenses?
Would it be easy/possible to extract the geospatial functionalities only and
use them with, say, TDB datasets?
I have not looked at the sources yet, sorry.
Paolo
On Sep 13, 2011, at 11:43 AM, Marco Neumann wrote:
what's your license model for Parliament?
On Tue, Sep 13, 2011 at 11:37 AM, Rob Battle <[email protected]> wrote:
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We also have an unpublished article [5] which describes GeoSPARQL, evaluates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:
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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
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--
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/
--
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/
