Towards a Web of Services

IEEEFINALYEARSTUDENTPROJECT

Keynote at NFPSLAM-SOC @ ECOWS 2010

Technology

Towards A
Web Of Services
Dr. Carlos Pedrinaci
Knowledge Media Institute - The Open University

NFPSLAM-SOC'10 - December 1st, Ayia Napa, Cyprus

Acknowledgements

• Stefan Dietze, Jacek Kopecky, Dong Liu,
Maria Maleshkova, Harry Yu (OU)
• Guillermo Alvaro (iSOCO)
• Irene Celino (CEFRIEL)
• SOA4All Project

Taken from the Introduction to Web Services by Oracle

Number of Web Services found by Seekda.com in the last 52 Months

On the web however the beneﬁts
may not be that clear!

What are the semantics
of the service?
... and most importantly ...

Where are they captured
for being processed?

Excerpt of OWL-S Excerpt of WSMO

Semantic Web OWL-S, WSMO, etc have been proposed
Although highly expressive they are
Service Ontologies expensive computationally and from an
annotation perspective

Classiﬁcation of QoS Attributes (Kritikos, K. and D. Plexousakis, 2007)

How new trends are
reshaping the Web
... and why should we care ...

Web APIs are the Widely used and reused
Publicly available
new Web services With a real business model behind them
Although harder automation!

“Linking Open Data cloud diagram, by Richard Cyganiak and Anja Jentzsch. http://lod-cloud.net/”

Linked Services
Exploiting the complementarity of
Services and Linked Data

Pedrinaci, C., and Domingue, J. (2010) Toward the Next Pedrinaci, C., Domingue, J., and Reto Krummenacher (2010) Services
Wave of Services: Linked Services for the Web of Data, and the Web of Data: An Unexploited Symbiosis, Linked AI: AAAI
Journal of Universal Computer Science. To Appear. Spring Symposium "Linked Data Meets Artificial Intelligence"

20

Web of Documents Web of Data

http://iserve.kmi.open.ac.uk

An Open and Standards-
Based Registry

• Supports access via
• Web Application - iServe Browser
• Read&Write RESTful API
• Linked Data principles
• SPARQL endpoint
• Content negotiation (RDF, HTML)

A Service Warehouse

• One of the largest publicly accessible Semantic
Service registries
• One of the most advanced registries for Web
APIs discovery
• Support for hybrid discovery
• Integration of social features (tags, comments,
ratings)
• Annotation recommendation

Status

• Publicly Available iserve.kmi.open.ac.uk
• Support for WSMO-Lite, MicroWSMO,
SAWSDL, OWL-S
• Around 2000 services
• OWL-S and SAWSDL Test Cases
• Import from Seekda
• Real services

SWEET - MicroWSMO Editor
Related Tooling
SOA4All Studio

SWEET - MicroWSMO Editor
Related Tooling SOWER - WSMO-Lite Editor
Mashups Editor
SOA4All Studio

SWEET - MicroWSMO Editor
Related Tooling SOWER - WSMO-Lite Editor
Mashups Editor
SOA4All Studio SPICES - Invocation Interface

Towards a
Web of Services
Generating and exploiting
a Web of Data about services

Linked User Publication in the Web of Data of
comments, tags, ratings by users
Feedback Based on Revyu.com but extended with
provenance and Web API

Analysis Warehouse Publication in the Web of Data of statistics
about services
Based on SDMX and traditional NFPs
Linked with service descriptions on iServe

How can this be
exploited?
An Example on Service Recommendation

SOA4All Studio Combining distributed sources of data
about services to better support the life-
cycle of service-oriented applications

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