SPARQL + WSDL Demonstrator

Goals:

• Identify the information in web services.
  • annotate existing descriptions
• Query that specific information.
• Automatically invoke the appropriate service(s).

Identifying information

• Popular languages are tailored to the consumer intuition.
• I chose SPARQL Annotations (SPARQL + XPath) in WSDL:
  • SPARQL: SQL-like RDF query language

    SELECT ?tile WHERE { ?response tnss:doctitle ?title }

  • XPath: identify locations in a document

    aws:ItemSearchResponse/aws:Items/aws:Item/aws:Title

  • WSDL: associate messages (documents) with services

    <definitions><types><element name="ItemSearchResponse"></element></types>...
        <message name="ItemSearchResponseMsg"/></definitions>

• Ties RDF data to locations in a Web Services message.

  • <xs:element name="Item" spat:SPAT='?book tns:doctitle xpath("aws:Title")'/>
    

Demonstration

What happens when the user issues a query?

1. Machine matches a service to the query.
2. Invokes the service.
3. Returns results to RDF data model.
4. Data reported to user (or used in further queries).

Next steps

• Refine selection criteria.
• Demonstrate interesting orchestration.
  (orchestration done by SQL-like unification)

Next steps

• Refine selection criteria.
• Demonstrate interesting orchestration.
  (orchestration done by SQL-like unification)

Watch the SPDL Home Page for progress.

Demo excerpts

PREFIX tnss: <http://webservices.amazon.com/AWSECommerceService/2004-11-10>
SELECT ?asin ?title WHERE {
 ?X tnss:id "0FWYBWB91M5S26YBE382" ;
    tnss:keywords "cola" ;
    tnss:index "Books" ;

    tnss:asin ?asin ;
    tnss:doctitle ?title }

asin	title
"0896584542"	"The Sparkling Story of Coca-Cola"
"0953984028"	"The World Stormrider Guide (Stormrider Guides)"
"0887307515"	"Secret Formula"
"0873493818"	"The Encyclopedia of Pepsi-Cola Collectibles (Encyclopedia of Pepsi-Cola Collectibles)"
"0896960528"	"The Cola Wars: The story of the global battle between the Coca-Cola Company and PepsiCo, Inc."
"1887432930"	"Coca-Cola Collectible Santas (Collector's Guide to Coca Cola Items Series)"
"0977184307"	"Splenda® Is It Safe Or Not?"
"0873492412"	"Petretti's Coca-Cola Collectibles Price Guide (Petretti's Coca-Cola Collectibles Price Guide)"
"0553568914"	"Elvis, Jesus and Coca-Cola (Kinky Friedman Novels (Paperback))"
"0465054684"	"For God, Country, and Coca-Cola: The Definitive History of the Great American Soft Drink and the Company That Makes It"