AKSW - Projects/R2D2

2007-02-23 12:14:25

Comparison for /Projects / R 2 D 2 of 2007-02-23 12:14:25 and 2007-02-23 12:14:51

Deletions:

Projects

SoftWiki
Powl
OntoWiki
DL-Learner
R2D2
Semantic LDAP
ATUIN
xOperator

2006-12-04 15:08:40

Comparison for /Projects / R 2 D 2 of 2006-12-04 15:08:40 and 2007-02-23 12:14:25

Additions:

2006-12-04 15:05:41

Comparison for /Projects / R 2 D 2 of 2006-12-04 15:05:41 and 2006-12-04 15:08:40

Additions:

R2D2 implements a new SPARQL2SQL rewriter. This feature is still in progress and buggy. Up to now only group patterns are supported! (for more information see the SPARQL complexity catalog (german version)

Deletions:

R2D2 implements a new SPARQL2SQL rewriter. This feature is still in progress and buggy. Up to now only group patterns are supported! (for more information see the SPARQL complexity catalog (german version)

2006-11-28 00:02:30

Comparison for /Projects / R 2 D 2 of 2006-11-28 00:02:30 and 2006-12-04 15:05:41

Additions:

R2D2 implements a new SPARQL2SQL rewriter. This feature is still in progress and buggy. Up to now only group patterns are supported! (for more information see the SPARQL complexity catalog (german version)

Deletions:

R2D2 implements a new SPARQL2SQL rewriter. This feature is still in progress and buggy. Up to now only group patterns are supported!

2006-11-27 23:58:02

Comparison for /Projects / R 2 D 2 of 2006-11-27 23:58:02 and 2006-11-28 00:02:30

Additions:

S�ren Auer for making all this possible

Deletions:

Soeren Auer for making all this possible

2006-11-27 23:56:21

Comparison for /Projects / R 2 D 2 of 2006-11-27 23:56:21 and 2006-11-27 23:58:02

Additions:

$sparqlQuery = «PREFIX foaf: <http://xmlns.com/foaf/0.1/>

Deletions:

$sparqlQuery = PREFIX foaf: <http://xmlns.com/foaf/0.1/>

2006-11-24 12:36:22

Comparison for /Projects / R 2 D 2 of 2006-11-24 12:36:22 and 2006-11-27 23:56:21

Additions:

The Semantic Web aims at giving data more structure and computer understandable meaning. For that RDF enables to add metadata to the unmanageable mass of data in the World Wide Web. Hence, the transformation of data located in relational databases to RDF plays an essential role. To provide such functionality our implementation R2D2 maps an RDF query to a legacy relational database without having to replicate the data.
R2D2 is be implemented in PHP and uses the RDF API for PHP (RAP) for querying a virtual R2D2-Graph. An R2D2-Graph is read only and may be used like other models in RAP by instantiating a new model named R2D2model. An R2D2model rewrites find(spo) and sparql() queries to SQL queries and transforms the SQL result set back into RDF triples. A database schema is mapped by the D2RQ Mapping Language – a declarative mapping language for describing the relation between an ontology and an relational data model.

querying a non-RDF database using SPARQL or find(spo).
R2D2 user manual (soon here – see below for a simple example)
08/20/2006: currently we implement a plug-in for the WordPress blog system. This first practical example will integrate header information in a wordpress post for the FOAF, SIOC and ATOM vocabulary. The header will contain a sparql-search-query so you can query a model through the PHP Net API from other web applications

R2D2 is a RAP Plug In. So first, you need to download RAP.
For installing R2D2 you simple have to copy the R2D2 directory into the main RAP folder.

Known Issues

R2D2 implements a new SPARQL2SQL rewriter. This feature is still in progress and buggy. Up to now only group patterns are supported!
Regular expressions in find(spo) or SPARQL are not yet supported.

Deletions:

The Semantic Web tries to give data more structure and computer understandable meaning. For that RDF will take care to add Metadata to the unmanageable mass of data in the World Wide Web. Thereby the transformation of data located in relational databases to RDF plays an essential role. A comfortable implementation will be a mapping mechanism, which maps a RDF query to a legacy relational database without having to replicate the data. For this we improved R2D2, a tool for mapping relational database content to RDF based ontologies.
R2D2 is be implemented in PHP und uses the RDF API for PHP (RAP) for querying a virtual R2D2-Graph. A R2D2-Graph is read only and may be used like other models in RAP by implementing a new model named R2D2model. A R2D2model rewrites find(spo) and sparql() queries to SQL queries and transform the SQL result set into RDF triples. A database schema is mapped by the D2RQ Mapping Language – a declarative mapping language for describing the relation between an ontology and an relational data model.

query a non-RDF database using SPARQL or find(spo).
R2D2 User Manual (soon here – see below for a simple example)
08/20/2006: currently we implement a Plug In for the WordPress blog system. This first practical example will integrate header information in a wordpress post for the FOAF, SIOC and ATOM vocabulary. The header will contain a sparql-search-query so you can query a model through the PHP Net API from other web applications

R2D2 is conceived as RAP Plug In. So first, you need to download RAP.
For installingR2D2 you simple have to copy the R2D2 directory into the main RAP folder.

known issues

R2D2 implements a new SPARQL2SQL Rewriter. This feature is still in progress and buggy. Up to now only group patterns are supported!
regular expressions in find(spo) or SPARQL are not yet supported.

2006-11-23 21:59:09

Comparison for /Projects / R 2 D 2 of 2006-11-23 21:59:09 and 2006-11-24 12:36:22

Additions:

Mapping file: file:wordpressd2rq.n3
Database dump: file:wordpressMySQL.sql (My SQL database)
foaf vocabulary: foaf-specification
find(spo) results of different queries against the database: Test Find.txt
SPARQL results of queries against the database: Test RDQL.txt

Deletions:

- Mapping file: file:wordpressd2rq.n3
- Database dump: file:wordpressMySQL.sql (My SQL database)
- foaf vocabulary: foaf-specification
- find(spo) results of different queries against the database: Test Find.txt
- SPARQL results of queries against the database: Test RDQL.txt
  .

2006-11-23 19:56:32

Comparison for /Projects / R 2 D 2 of 2006-11-23 19:56:32 and 2006-11-23 21:59:09

Additions:

known issues

R2D2 implements a new SPARQL2SQL Rewriter. This feature is still in progress and buggy. Up to now only group patterns are supported!
regular expressions in find(spo) or SPARQL are not yet supported.