1. © 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:oerling@openlinksw.com

2. © 2007 OpenLink Software, All rights reserved 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

3. © 2007 OpenLink Software, All rights reserved 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

4. © 2007 OpenLink Software, All rights reserved What We Hope Write The Final Chapter of the Information Integration Saga!

5. © 2007 OpenLink Software, All rights reserved 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

6. © 2007 OpenLink Software, All rights reserved An Ideal Solution

7. © 2007 OpenLink Software, All rights reserved Virtuosos RDF Views of SQL Data Functionality

8. © 2007 OpenLink Software, All rights reserved 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

9. © 2007 OpenLink Software, All rights reserved 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

10. © 2007 OpenLink Software, All rights reserved 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

11. © 2007 OpenLink Software, All rights reserved Northwind Demo Database Tables include: Customer ID Company Name Contact Name Contact Title AddressCityPostal Code CountryPhoneFax varchar(5)varchar(40)varchar(30) varchar(60)varchar(15)varchar(10 ) varchar(15)varchar(24) ALFKIAlfreds Futterkiste Maria Anders Sales Represe- ntative Obere Str. 57 Berlin12209Germany030 - 0074321 030 - 0076545 ANATRAna Trujillo Emparedados y helados Ana TrujilloOwnerAvda. de la Constitucion 2222 Mexico D.F. 05021Mexico(5) 555 - 4729 (5) 555 - 3745 ANTONAntonio Moreno Taqueria Antonio Moreno OwnerAvda. de la Constitucion 2222 Mexico D.F. 05023Mexico(171) 555 - 7788 (171) 555 - 6759 Demo.demo.Orders Order IDCustomer ID Employee ID Order Date Required Date Shipped Date Ship Via… 10643ALFKI61995-09-251995-10-231995-10-031… 10692ALFKI41995-11-031995-12-011995-11-132… ………………… Demo.demo.Customers

12. © 2007 OpenLink Software, All rights reserved Northwind Demo Database: RDF View Definition Extract Customer ID Company Name Contact Name Contact Title AddressCityPostal Code CountryPhoneFax prefix northwind: … create iri class northwind:Customer (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.

13. © 2007 OpenLink Software, All rights reserved Northwind Demo Database: RDF View Definition Extract Order IDCustomer ID Employee ID Order Date Required Date Shipped Date Shipped Via … prefix northwind: … create iri class northwind:Order (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 ;

14. © 2007 OpenLink Software, All rights reserved Northwind Demo Database: Customer Table to RDF Entity Mapping Customer ID Company Name Contact Name Contact Title AddressCityPostal Code CountryPhoneFax ALFKIAlfreds Futterkiste Maria Anders Sales Represe- ntative Obere Str. 57 Berlin12209Germany030 - 0074321 030 - 0076545 companyName contactName contactTitle addresscity PostalCode country phone fax Alfreds Futterkiste Maria Anders Sales Representative Obere Str. 57 Berlin 12209 Germany 030-0074321 030-0076545 … Order/10643#this has_order Order/10692#this … has_order Customer/ALFKI#this prefix has_customer Order ID Customer ID … 10643ALFKI… 10692ALFKI… Orders Table

15. © 2007 OpenLink Software, All rights reserved 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

16. © 2007 OpenLink Software, All rights reserved 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

17. © 2007 OpenLink Software, All rights reserved What We Need Interop of Necessary SPARQL Extensions Visual Tools for SQL-RDF Mapping SQL-RDF Mapping Syntax Standardization Community Consensus on RDF Vocabularies

18. © 2007 OpenLink Software, All rights reserved 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

19. © 2007 OpenLink Software, All rights reserved 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

20. © 2007 OpenLink Software, All rights reserved 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

21. © 2007 OpenLink Software, All rights reserved Additional Information http://virtuoso.openlinksw.com (general site) http://virtuoso.openlinksw.com http://virtuoso.openlinksw.com/wiki/main/ (Open Source Edition Site) http://virtuoso.openlinksw.com/wiki/main/ http://virtuoso.openlinksw.com/Whitepapers/inde x.htm ( OpenLink Data Spaces) http://virtuoso.openlinksw.com/Whitepapers/inde x.htm

22. © 2007 OpenLink Software, All rights reserved Thank You!