Database Technology for the Semantic Web

Vissili Christophides

9/10/01


Start


Table

Database Technology for the Semantic Web

On the Semantic Web

4 + 1 Webs?

Metadata exists for Almost Anything/Everywhere

RDF Objectives

Outline

The Data Independence Issue

The Query Language Issue

Why a Data Model for RDF ?

But RDF has specifics: Serialization syntax

But RDF has specifics: Schema Semantics

But RDF has specifics: Superimposed Descriptions

Existing Data Models

A Semistructured Data Model for RDF

Towards a Formal Data Model for RDF

Why a Type System for RDF ?

Towards a Type System for RDF

Diapositive PPT

Schema Constraints

Data Constraints

Comparing RDF/S to XML DTD/Schemas

Looking at existing RDF Applications

Statistics of RDF Schemas

Statistics of RDF Schemas

Statistics of RDF Schemas

Querying RDF Descriptions: An Introduction to RQL

The RDF Query Language (RQL)

A Cultural Community Resource Description Example

Querying Large RDF Schemas with RQL

Class & Property Querying

Schema Navigation using RQL

Exporting Schemas using RQL Queries

Querying Complex RDF Descriptions with RQL

Navigating in Description Graphs using RQL

Using Schema to Filter Resource Descriptions

Discover the Schema of RDF Descriptions

And if you still like triples

Comparing RQL to W3C XQuery

Comparing RQL to W3C XQuery

Comparing RQL to W3C XQuery

Comparing RQL to W3C XQuery

Comparing RQL to W3C XQuery

Diapositive PPT

Modeling the ODP Catalog with RDF/S

ODP Statistics

Generic Representation

Specific Representation

DBMS Size vs. Schema Triples

DBMS Size vs. Data Triples

Query Templates for RDF description bases

Execution Time of RDF Benchmark Queries

Comparison

The ICS-FORTH RDFSuite: High-level and Scalable Tools for the Semantic Web http://139.91.183.30:9090/RDF/

Diapositive PPT

The RDFSuite Main Components

The RDFSuite Architecture

Validating RDF Parser (VRP)

VRP Interface

VRP Features

RDF Schema Specific DataBase (RSSDB)

RSSDB Interface

RSSDB Features

RDF Query Language (RQL)

RQL Web Interface

RQL Features

RDFSuite Summary

Other Issues

RDF and XML: Convergence or Divergence ?

Diapositive PPT

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