RDF tools - Linköping University

quaggahooliganInternet and Web Development

Feb 5, 2013 (4 years and 6 months ago)

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RDF(S) Tools

Adrian Pop, adrpo@ida.liu.se

Programming Environments Laboratory

Linköping University



November 03, 2003

2

<Outline/>


Introduction


Tool categories


parsers, validators


editors, query tools


databases, crawlers


Editors demos


RDFAuthor, IsaViz, RDFedt, InferEd


Query Tools


Jena RDQL demo


Conclusions

November 03, 2003

3

<Introduction/>


Resource Description Framework (RDF)


standard for describing resources on the web


RDF Schema (RDFS)


RDF Vocabulary Description Language


RDF(S) Tools must


read RDF data (parsers/validators)


store RDF data (XML format, triples, or
relational/OO DBs)


use RDF data (applications, RSS news, etc)


manipulate RDF data (inference, query, etc)

November 03, 2003

4

<Categories/>


Parsers (Jena, Redland, SWI
-
Prolog parser)


Validators (W3C RDF Validation service)


Editors (IsaViz, RDFAuthor, RDFEd, InferEd)


Query tools (Jena, etc)


Databases (RSSDB, RDFLib)


November 03, 2003

5

<Parsers part=“1”/>


Jena
-

A semantic Web Framework for Java


http://jena.sourceforge.net/


A RDF API


Reading and writing RDF in RDF/XML, N3 and
N
-
Triples


An OWL API


In
-
memory and persistent storage


RDQL


a query language for RDF


Later on, a RDQL demo

November 03, 2003

6

<Parsers part=“2”/>


Redland RDF Application Framework


http://www.redland.opensource.ac.uk/


A modular, object based library written in C


Java, Perl, PHP, Python, Ruby and Tcl interfaces for
manipulating the RDF graph and parts


Parsers and Serializers for reading and writing RDF


Storage for graphs in memory and on disk


Query APIs for the graph by Statement (triples) or by
Nodes and Arcs


Statement Streams for construction, parsing,
de/serialisation of graphs


Start of query language support.


No memory leaks so far

November 03, 2003

7

<Parsers part=“3”/>


SWI
-
Prolog parser (Online Demo)


http://gollem.swi.psy.uva.nl/cgi
-
bin/pl
-
cvsweb/pl/packages/sgml/RDF/online.html?rev=1.11


RDFS explorer, RDF Semantic Extensions


http://wonkituck.wi
-
inf.uni
-
essen.de/rdfs.html


Interesting feature:


provide semantics in Prolog for your properties

<rdf:Property rdf:ID="path">


<rdfs:isDefinedAs rdf:parseType="Literal">


path(S,O) :
-

statement(S,path,O).


path(X,Z) :
-

statement(X,path,Y), path(Y,Z).


</rdfs:isDefinedAs>


</rdf:Property>

November 03, 2003

8

<Validators/>


RDF Validation Service


http://www.w3.org/RDF/Validator/


Validating RDF Parser


http://139.91.183.30:9090/RDF/index.html


In general all the RDF parsers do some kind
of validation


November 03, 2003

9

<Editors part=“1” demo=“yes”/>


RDFAuthor


http://rdfweb.org/people/damian/2001/10/RDFAuthor/



RDFAuthor Demo


November 03, 2003

10

<Editors part=“2” demo=“yes”/>


IsaViz


http://www.w3.org/2001/11/IsaViz/



IsaViz Demo


November 03, 2003

11

<Editors part=“3” demo=“yes”/>


RDFedt


http://www.jan
-
winkler.de/dev/e_rdfe.htm



RDFedt demo


November 03, 2003

12

<Editors part=“4” demo=“yes”/>


InferEd


http://www.intellidimension.com/pages/site/
products/infered/



InferEd Demo


November 03, 2003

13

<Query demo=“yes”/>


Jena RDQL examples


Queries over the
foaf.rdf

file


Query 1, Select all

SELECT *

WHERE(?x ?y ?z)



Query 1, Select persons that knows me

SELECT ?person, ?knows

WHERE(?x <http://xmlns.com/foaf/0.1/knows> ?z),


(?x <http://xmlns.com/foaf/0.1/name> ?person),


(?z <http://xmlns.com/foaf/0.1/name> ?knows)


Go

November 03, 2003

14

<Databases/>

Storage of RDF graphs


Files


xml format, .n3 format, N
-
triples format



Databases


relational databases (MySQL, PostgreSQL)


Object
-
Oriented Databases (ZODB)

November 03, 2003

15

<Conclusions/>


RDF Tools


are mature enough


become more complex


RDF is more widely used


RSS feeds


Mozilla sidebar, Bookmarks, etc


RDFGateway (application + web + RDF
deductive DB)


November 03, 2003

16

<End/>

Thank you!

Questions?

November 03, 2003

17

Resources

Ontology Storage and Querying

http://139.91.183.30:9090/RDF/publications/tr308.pdf

RDF Schema explorer + RDF Semantic Extensions

http://wonkituck.wi
-
inf.uni
-
essen.de/rdfs.html

Dave Beckett's Resource Description Framework (RDF) Resource Guide

http://www.ilrt.bris.ac.uk/discovery/rdf/resources/

RDFAuthor, RDFAuthor Tutorial

http://rdfweb.org/people/damian/2001/10/RDFAuthor/

http://rdfweb.org/people/damian/2001/10/RDFAuthor/Tutorial/

Jena
-

A semantic Web Framework for Java

http://jena.sourceforge.net/

Redland RDF Application Framework

http://www.redland.opensource.ac.uk/

RDF Validation Service

http://www.w3.org/RDF/Validator/

Validating Parser (VRP), RDF Schema Specific Database (RSSDB), The RDF Query Language (RQL)

http://139.91.183.30:9090/RDF/index.html

RDFedt

http://www.jan
-
winkler.de/dev/e_rdfe.htm