© 2007 openlink software, all rights reserved openlink virtuoso - sql & rdf rdf views of sql...

© 2007 OpenLink Software, All rights reserved

OpenLink Virtuoso - SQL & RDF

RDF Views of SQL Data

(Exposing SQL Data as RDF)

Orri Erling

Program Manager - OpenLink Virtuoso

mailto:[email protected]





Virtuoso Universal Server

• Native SQL & XML DBMS

• Federated / Hybrid Data Server (Virtual Database Engine)

• Web Services Platform

• SQL to RDF Mapping

• Native RDF Quad Store (with SPARQL support)

• In-built RDF Middleware (“Sponger”)

• RDF Linked Data Deployment Platform


Situation Analysis

Data Drives Everything

Data Heterogeneity is a fact of life

There is no Information without Data

The Era of Information Overload is Neigh

Information Processing drives Corporate &

Individual Agility


What We Hope

Write TheFinal Chapter of the Information Integration

Saga!


Yes, if...

SPARQL to Match SQL for BI Queries

Tools and Training for the Information

Architect

Successful Migration of Domain Specific

XML Vocabularies to RDF


An Ideal Solution


Virtuoso’s

RDF Views of SQL Data

Functionality


What are RDF Views?

Expose pre-existing relational data as virtual RDF

graphs

Available for querying through SPARQL or

SPASQL (SPARQL embedded in SQL)

No physical regeneration of relational data


Virtuoso RDF Views Implementation

Quad Patterns Translate Relational Data to G, S, P, O

Map Local or Heterogeneous Remote Data To RDF

Map XML/Text/Web Services to RDF via Table Valued Functions

Sophisticated Query Transformations and Optimization


Virtuoso SPARQL and SQL Extensions

Aggregates, Grouping, Full Text for SPARQL

SQL "Breakup" for Mapping Wide Rows to n-

Triples

Freely Intermingle SQL and SPARQL


Northwind Demo DatabaseTables include:

Customer ID

Company Name

Contact Name

Contact

Title

Address City Postal Code

Country Phone Fax

varchar(5) varchar(40) varchar(30) varchar(30) varchar(60) varchar(15) varchar(10)

varchar(15) varchar(24) varchar(24)

ALFKI Alfreds Futterkiste

Maria Anders

Sales Represe-ntative

Obere Str. 57

Berlin 12209 Germany 030 - 0074321

030 - 0076545

ANATR Ana Trujillo Emparedados y helados

Ana Trujillo Owner Avda. de la Constitucion 2222

Mexico D.F.

05021 Mexico (5) 555 -4729

(5) 555 - 3745

ANTON Antonio Moreno Taqueria

Antonio Moreno

Owner Avda. de la Constitucion 2222

Mexico D.F.

05023 Mexico (171) 555 - 7788

(171) 555 - 6759

Demo.demo.OrdersOrder ID Customer

IDEmployee ID

Order

Date

RequiredDate

Shipped Date

Ship Via …

10643 ALFKI 6 1995-09-25 1995-10-23 1995-10-03 1 …

10692 ALFKI 4 1995-11-03 1995-12-01 1995-11-13 2 …

… … … … … … …

Demo.demo.Customers


Northwind Demo Database:RDF View Definition Extract

Customer ID

Company Name

Contact Name

Contact

Title


Country Phone Fax

prefix northwind: <http://www.openlinksw.com/schemas/northwind#>

…

create iri class northwind:Customer <http://^{URIQADefaultHost}^/Northwind/Customer/%U#this> (in customer_id varchar not null)

…

alter quad storage virtrdf:DefaultQuadStorage

…

from Demo.demo.Customers as customers

from Demo.demo.Orders as orders … {

Demo.demo.Customers

Northwind RDF View Definition

create virtrdf:NorthwindDemo as graph iri (“http://^{URIQADefaultHost}^/Northwind”) {

…

northwind:Customer(customers.CustomerID) a foaf:Organization as virtrdf:Customer-CustomerID ;

northwind:companyName customers.CompanyName as … ;

…

northwind:fax customers.Fax as virtrdf:Customer-fax .

…

} }

northwind:Customer(orders.CustomerID)northwind:has_order northwind:Order(orders.OrderID) as virtrdf:Order-has_order .


Northwind Demo Database:RDF View Definition Extract

Order ID CustomerID

Employee

ID

OrderDate

RequiredDate

Shipped

Date

ShippedVia

…

prefix northwind: <http://www.openlinksw.com/schemas/northwind#>

…

create iri class northwind:Order <http://^{URIQADefaultHost}^/Northwind/Order/%d#this> (in order_id integer not null) .

…

alter quad storage virtrdf:DefaultQuadStorage

…

from Demo.demo.Customers as customers

from Demo.demo.Orders as orders … {

Demo.demo.Orders

Northwind RDF View Definition

create virtrdf:NorthwindDemo as graph iri (“http://^{URIQADefaultHost}^/Northwind”) {

…

northwind:Order (orders.OrderID) a northwind:Order as virtrdf:Order-Order ;

northwind:orderDate orders.OrderDate as virtrdf:Order-order_date ;

northwind:requiredDate orders.RequiredDate as virtrdf:Order-required_date ;

…

…

} }

northwind:has_customer northwind:Customer (orders.CustomerID) as virtrdf:Order-order_has_customer

northwind:has_employee northwind:Employee (orders.EmployeeID) as virtrdf:Order-order_has_employee ;


Northwind Demo Database:Customer Table to RDF Entity Mapping

Customer ID

Company Name

Contact Name

Contact

Title


Country Phone Fax

ALFKI Alfreds Futterkiste

Maria Anders

Sales Represe-ntative

Obere Str. 57

Berlin 12209 Germany 030 - 0074321

030 - 0076545

companyName

contactName

contactTitle

address city

PostalCode

country

phone

fax

AlfredsFutterkiste

MariaAnders

SalesRepresentative

Obere Str. 57

Berlin

12209

Germany

030-0074321

030-0076545

…

Order/10643#this

has_order

Order/10692#this

…

has_order

Customer/ALFKI#this

prefix <http://demo.openlinksw.com/Northwind/> has_customer

has_customer

Order ID

CustomerID

…

10643 ALFKI …

10692 ALFKI …

Orders Table


Facilitate Information at Your Finger Tips

Provide a Conceptual View of Logical Data

Make the Conceptual Views concrete focal points of Data

Access

Identify Data Entities using URIs (Data Links) e.g

http://demo.openlinksw.com/Northwind/Customer/ALFKI#this

Identify Associations / Relationships with other Entities

using URIs e.g http://www.openlinksw.com/schemas/northwind#has_order


SQL-RDF Mapping Experiences

Mapping is Non-Trivial

Problems Start When Many Tables Map to the

Same Thing

Choice of URI Scheme Can Greatly Affect

Optimization Possibilities


What We Need

Interop of Necessary SPARQL Extensions

Visual Tools for SQL-RDF Mapping

SQL-RDF Mapping Syntax Standardization

Community Consensus on RDF Vocabularies


It is NOT about RDF vs. XML vs. SQL

Web Services are for Transactions and App.

Integration

RDF is for Disparate Data Meshing, Discovery,

and Drill Down/Analysis

SQL is Forever


SQL-RDF Integration Value

Enterprise: Alleviation of heterogeneous data

integration challenges

Public: A Whole Economy of Discoverable

Linked Data and Data Mesh-ups

Now: Full Text For All - Next: Analysis For All


OpenLink Futures

Commercial Deployment of SQL to RDF Mapping

Towards Web-scale with Clustered RDBMS/Triple

Store

OpenLink Data Spaces (ODS) for Bootstrapping

SemWeb Presence


Additional Information

http://virtuoso.openlinksw.com (general site)

http://virtuoso.openlinksw.com/wiki/main/ (Open

Source Edition Site)

http://virtuoso.openlinksw

.com/Whitepapers/index.htm (OpenLink Data

Spaces)

http://virtuoso.openlinksw.com/



http://virtuoso.openlinksw.com/wiki/main/




http://virtuoso.openlinksw.com/Whitepapers/index.htm





Thank You!

© 2007 openlink software, all rights reserved openlink virtuoso - sql & rdf rdf views of sql...

Documents

orderorder northwind

customer northwind

date northwind

rdf slide

order orders

employee northwind

openlink software

customercustomerid northwind