Virtuoso's SQL to RDF Technology Presentation (W3C RDF & DBMS Integration Workshop 10-25-2007)

OpenLink Virtuoso - SQL & RDF RDF Views of SQL Data (Exposing SQL Data as RDF) Orri Erling Program Manager - OpenLink Virtuoso mailto: [email_address] .com

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 The
Final 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 Database
Tables include:
Demo.demo.Orders Demo.demo.Customers varchar(24) varchar(24) varchar(15) varchar(10) varchar(15) varchar(60) varchar(30) varchar(30) varchar(40) varchar(5) Mexico Mexico Germany Country (171) 555 - 7788 (5) 555 -4729 030 - 0074321 Phone 05023 05021 12209 Postal Code Avda. de la Constitucion 2222 Avda. de la Constitucion 2222 Obere Str. 57 Address Mexico D.F. Mexico D.F. Berlin City (5) 555 - 3745 Owner Ana Trujillo Ana Trujillo Emparedados y helados ANATR (171) 555 - 6759 Owner Antonio Moreno Antonio Moreno Taqueria ANTON 030 - 0076545 Sales Represe-ntative Maria Anders Alfreds Futterkiste ALFKI Fax Contact Title Contact Name Company Name Customer ID … 2 1995-11-13 1995-12-01 1995-11-03 4 ALFKI 10692 … … … … 1 Ship Via … 1995-10-23 Required Date … 1995-10-03 Shipped Date … … … 1995-09-25 6 ALFKI 10643 Order Date Employee ID Customer ID Order ID

Northwind Demo Database: RDF View Definition Extract
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 . Country Phone Postal Code Address City Fax Contact Title Contact Name Company Name Customer ID

Northwind Demo Database: RDF View Definition Extract
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 ; Shipped Via … Required Date Shipped Date Order Date Employee ID Customer ID Order ID

Northwind Demo Database: Customer Table to RDF Entity Mapping Orders Table Germany Country 030 - 0074321 Phone 12209 Postal Code Obere Str. 57 Address Berlin City 030 - 0076545 Sales Represe-ntative Maria Anders Alfreds Futterkiste ALFKI Fax Contact Title Contact Name Company Name Customer ID companyName contactName contactTitle address city 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 <http://demo.openlinksw.com/Northwind/> has_customer has_customer … ALFKI 10643 … ALFKI 10692 … Customer ID Order ID

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)

Thank You!

Virtuoso's SQL to RDF Technology Presentation (W3C RDF & DBMS Integration Workshop 10-25-2007)

by rumito on Nov 20, 2007

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Virtuoso’s SQL to RDF Technology Presentation (W3C RDF & DBMS Integration Workshop 10-25-2007) — Presentation Transcript