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Message-ID: <19e0530f0702020752m1d0d0104p906a99249081df32@mail.gmail.com>
Date: Fri, 2 Feb 2007 10:52:52 -0500
From: "Davanum Srinivas" <davanum@gmail.com>
Reply-To: dims@apache.org
To: general@incubator.apache.org
Subject: Re: [VOTE] TripleSoup - a SPARQL endpoint for httpd
In-Reply-To: <db94f1a0702020435q4e7ebc0bu70b7843f76420e60@mail.gmail.com>
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References: <62B54503-E13A-4210-BA15-B22B7FAFDC71@leosimons.com>
	 <db94f1a0702020435q4e7ebc0bu70b7843f76420e60@mail.gmail.com>

+1 from me.

-- dims

On 2/2/07, Yoav Shapira <yoavs@apache.org> wrote:
> +1, sounds very interesting.
>
> Yoav
>
> On 2/2/07, Leo Simons <mail@leosimons.com> wrote:
> > Hi all,
> >
> > This is a vote on a previously posted proposal to start a rdf
> > database server project at apache. The entire proposal text is
> > included below. There is only one change from the one posted to the
> > [proposal] thread -- we will start without a triplesoup-users@
> > mailing list.
> >
> > Please place your votes!
> >
> > +1 from me.
> >
> > This vote will run until we have a huge amount of enthousiastic +1s,
> > with a sizeable amount of them from the Incubator PMC, and at a
> > minimum for 72 hours. If you're not a part of the incubator PMC,
> > you're still welcome to express support (or lack of it) for the
> > proposal by voting; I will sort out votes when counting. (formal
> > voting rules on incubator website)
> >
> > cheers!
> >
> > - Leo
> >
> > ---
> > = summary =
> >
> > TripleSoup is the simplest thing that you can do to turn your apache
> > web server into a SPARQL endpoint.
> >
> > TripleSoup will be an RDF [2] store [3], tooling to work with that
> > database, and a REST [4] web interface to talk to that database using
> > SPARQL [5], implemented as an apache webserver module.
> >
> > {{{
> > Target:    TLP
> > Sponsor:   Incubator PMC
> > Champion:  Leo Simons <leosimons@apache.org>
> > Mentors:   Dirk-Willem van Gulik <dirkx@apache.org>,
> >             Ben Hyde <bhyde@apache.org>,
> >             Stefano Mazzocchi <stefano@apache.org>,
> >             Leo Simons <leosimons@apache.org>
> > Resources: SVN:     https://svn.apache.org/repos/asf/incubator/
> > triplesoup/
> >             Website: http://incubator.apache.org/triplesoup/
> >             Jira:    http://issues.apache.org/jira/browse/TRIPLES
> >             Wiki:    http://wiki.apache.org/triplesoup/
> >             Mailing lists:
> >                      triplesoup-dev@incubator.apache.org
> >                      triplesoup-commits@incubator.apache.org
> >                      triplesoup-private@incubator.apache.org
> >              Moderators: leosimons@apache.org
> >                          stefano@apache.org
> >                          dreid@apache.org
> > Initial committers:
> >             Dave Beckett <dave@dajobe.org>, redland author
> >             Dirk-Willem van Gulik <dirkx@apache.org>,
> >             Ben Hyde <bhyde@apache.org>,
> >             Stefano Mazzocchi <stefano@apache.org>,
> >             Andrea Marchesini <baku@theveniceproject.com>, b store
> > author
> >             Alberto Reggiori <alberto@asemantics.com>, rdfstore author
> >             David Reid <dreid@apache.org>,
> >             Leo Simons <leosimons@apache.org>
> > Initial source:     mod_sparql, commercial triple store,
> >                      existing open source triple store
> > Known risks:        None
> > Technologies:       c
> > Reference:          http://wiki.apache.org/incubator/TripleSoupProposal
> > }}}
> >
> > = Proposal details =
> >
> > == Technology (basics) ==
> >
> > What is RDF? It is just about any kind of data, represented as
> > triples of
> > (subject, predicate, object), usually with a rich vocabulary
> > describing the
> > semantics of the data (with the vocabulary typically also encoded as
> > triples).
> >
> > This data has a representation as RDF/XML as well as using other
> > formats such
> > as N3, and a query language SPARQL for searching through it. See [6]
> > for an
> > overview.
> >
> > So if it is just some data in some format, why does it need a special
> > server? Because RDF data is fundamentally not constrained to a
> > "file", and
> > there often is no "resource identifier" that readily identifies
> > something as a
> > "document" which can be served up over HTTP.
> >
> > So why the REST interface? RDF is one of the building blocks proposed
> > for the
> > "semantic web", and that's why a system that works well with/over
> > HTTP is
> > needed from the start.
> >
> > == Technology (concrete) ==
> >
> > This is just an example. Imagine that there is an application
> > "someapp" on
> > the host foo.example.com which provides access to information about
> > books,
> > and you want to get a list of those books (their URIs) and the names
> > of the
> > books.
> >
> > {{{
> > $ telnet foo.example.com 80
> > SELECT /someapp HTTP/1.0
> > Host: foo.example.com
> > Query-Language: http://www.w3.org/TR/2006/CR-rdf-sparql-query-20060406/
> > Accept: application/sparql-results+xml, rdf/xml, rdf/n3
> >
> > PREFIX books:   <http://example.org/book/>
> > PREFIX dc:      <http://purl.org/dc/elements/1.1/>
> > SELECT ?book ?title
> > WHERE
> >    { ?book dc:title ?title }
> >
> > HTTP/1.0 200 Ok
> > Content-Type: application/sparql-results+xml
> > Content-Length: 1234
> >
> > <?xml version="1.0"?>
> > <sparql
> >      xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
> >      xmlns:xs="http://www.w3.org/2001/XMLSchema#"
> >      xmlns="http://www.w3.org/2005/sparql-results#">
> >    <head>
> >      <variable name="book"/>
> >      <variable name="title"/>
> >    </head>
> >    <results ordered="false" distinct="false">
> >      <result>
> >        <binding name="book">
> >          <uri>http://example.org/book/book6</uri>
> >        </binding>
> >        <binding name="title">
> >          <literal>Harry Potter and the Half-Blood Prince</literal>
> >        </binding>
> >      </result>
> >    </results>
> > </sparql>
> >
> > Connection closed by foo.example.com
> > $
> > }}}
> >
> > It turns out there's only one book in the database in this example.
> > (Sample data taken from http://www.sparql.org/). David Reid has some
> > code that
> > does something not unlike this already [7], implemented as a httpd
> > module,
> > using the Redland library [11,12] as its backend store.
> >
> > == What would you use TripleSoup for? ==
> >
> > * It could be a backend for piggy bank [8].
> >
> > * It could be a backend for the next version of wikipedia.
> >
> > * It could be a backend for an "open" version of iTunes or IMDB.
> >
> > * It could be the backend for the information management system of the
> > Dutch ministry of water management [9].
> >
> > * It could be the backend for projects.a.o [10] and similar
> > applications.
> >
> > * Most importantly, it could be a backend for dozens of useful new
> > innovative
> > projects that no-one has envisioned yet.
> >
> > == The initial source ==
> >
> > RDFstore is a standalone RDF storage system implemented as a C
> > library, licensed
> > under the ASL 1.1. It has perl bindings. Find its distribution at [15].
> >
> > mod_sparql [7] is an in-development apache module that implements a
> > SPARQL
> > endpoint. It is licensed under the Apache License 2.0. It uses
> > redland as a
> > backend. The SVN repository can be found at [7].
> >
> > B is an in-development storage backend for Redland implemented as a
> > standalone
> > C library. It is currently a closed source codebase. A code snapshot
> > can be
> > found at [16].
> >
> > == The initial committers ==
> >
> > Dirk-Willem, Ben, Stefano, David and Leo are ASF members who
> > hopefully need no
> > introduction.
> >
> > Dave Beckett is the primary author of the Redland RDF application
> > framework.
> >
> > Alberto Reggiori is the primary author of rdfstore, an rdf store
> > developed by
> > asemantics [13], which will be contributed to TripleSoup. He is a
> > partner at
> > asemantics.
> >
> > Andrea Marchesini is the primary author of B, a storage backend for RDF
> > developed at Joost [14], which will be contributed to TripleSoup.
> >
> > All initial committers have experience working on open source
> > projects. They
> > work for at least 5 different companies.
> >
> > == TripleSoup as an apache project ==
> >
> > We think TripleSoup will have to reference dozens of specifications
> > from the
> > W3C (XML, RDF, OWL, SPARQL, their standards for URIs, and more) and
> > from the
> > IETF (HTTP, URL, URI, URN, and more), will make use of or integrate
> > with quite
> > a few existing open source projects (like the redland RDF libraries
> > as well as
> > apache apr&httpd). As such, it seems like TripleSoup should fit in
> > really well
> > at apache.
> >
> > The responses we got from various members of the RDF and semantic web
> > communities so far when discussing this proposal with them have all been
> > quite positive, and we expect and hope there'll be quite a few people
> > new to apache joining the project soon after it starts.
> >
> > Most importantly, we think this project will be useful, innovative, and
> > fun!
> >
> > = References =
> >
> > {{{
> > [1] http://incubator.apache.org/
> > [2] http://www.w3.org/RDF/
> > [3] these are often called "triple stores"
> > [4] http://www.ics.uci.edu/~fielding/pubs/dissertation/
> > rest_arch_style.htm
> > [5] http://www.w3.org/TR/rdf-sparql-query/
> > [6] http://www.betaversion.org/~stefano/papers/ac2006.1.pdf
> > [7] http://david-reid.com/repos/public/mod_sparql/
> > [8] http://simile.mit.edu/wiki/Piggy_Bank
> > [9] http://www.wadi.nl/uk/
> > [10] http://projects.apache.org/
> > [11] http://www.librdf.net/
> > [12] http://svn.librdf.org/repository/
> > [13] http://www.asemantics.com/
> > [14] http://www.joost.com/
> > [15] http://rdfstore.sourceforge.net/downloads/RDFStore-0.51.tar.gz
> > [16] http://opensource.joost.com/libb/
> > }}}
> >
> >
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-- 
Davanum Srinivas :: http://wso2.org/ :: Oxygen for Web Services Developers

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