UML + OWL Ontology and SPARQL

This demo of the TwoUse Toolkit shows UML class diagram, OWL ontology and SPARQL to dynamically classify instances at runtime. We model the variations of the class SalesOrder with the web ontology language, namely USSalesOrder and GermanSalesOrder. Later, we write a query operation that asks for the most specific type of the contextual object.

Improving Software Design Patterns with UML, OWL and SPARQL

We deal with problems in common design patterns and proposes OWL to remedy these issues. We exploit the TwoUse approach, which integrates OWL and UML class diagrams to overcome drawbacks of the Strategy Pattern, that are also extensible to the Abstract Factory Pattern.

UML, OWL and SPARQL with TwoUse Toolkit - Demo

Since MDE and OWL provide complementary benefits, contemporary software development should make use of both approaches. This demo presented at the Sixth European Conference on Modeling Foundations and Applications enlightens the improvements from an integrated approach.

Querying OWL Ontologies with OWL Syntax

Writing SPARQL queries for OWL ontologies can be time-consuming for those who do not do it everyday. Therefore, Mark Schneider has built a handy language, allowing users querying using OWL syntax -- SPARQLAS. These queries are translated into SPARQL queries that can be executed in a SPARQL engine that supports the OWL DL entailment regime, e.g., pellet.

The syntax is simple: You use the OWL Functional Syntax or a shortened version of it, and you can use variables wherever you have an entity (Class, Datatype, ObjectProperty, DataProperty, NamedIndividual) or a literal. You can construct nested expressions that use these variables.

Example

All subclasses of pizza that have as topping some topping with spiciness hot.

In SPARQLAS OWL Functional Syntax:
Namespace ( = <http://www.co-ode.org/ontologies/pizza/pizza.owl#> )
Query (
  SubClassOf ( ?x ObjectIntersectionOf ( Pizza ObjectSomeValuesFrom ( hasTopping ObjectIntersectionOf ( PizzaTopping ObjectSomeValuesFrom ( hasSpiciness Hot ) ) ) ) )
)

In SPARQLAS Shortened Functional Syntax:
Namespace ( = <http://www.co-ode.org/ontologies/pizza/pizza.owl#> )
Query (
  SubClassOf ( ?x And ( Pizza Some ( hasTopping And ( PizzaTopping Some (hasSpiciness Hot ) ) ) ) )
)

You can try it in two different ways:

• Web: A HTML client with many examples is available on http://twouse.west.uni-koblenz.de/services/sparqlas2sparql.php
• TwoUse Toolkit: The query language is distributed as part of the TwoUse toolkit. More information on http://twouse.googlecode.com/

Integrate it in your application

• Web Service. Translating SPARQLAS into SPARQL is available as web service under http://twouse.west.uni-koblenz.de:8080/services/sparqlas2sparql?wsdl .

• Standalone: The standalone bundle for java is available on http://code.google.com/p/twouse/downloads/list