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In recent development, attempts have been made to integrate UML and OWL into one hybrid modeling language, namely TwoUse. This aims at making use of the benefits of both modeling languages and overcoming the restrictions of each. In order to create a modeling language that will actually be used in software development an integration with OCL is needed. This integration has already been described at the contextual level in, however an implementation is lacking so far. The scope of this paper is the programatical implementation of the integration of TwoUse with OCL. In order to achieve this, two different OCL implementations that already provide parsing and interpretation functionalities for expressions over regular UML. This paper presents two attempts to extend existing OCL implementations, as well as a comparison of the existing approaches.
SPARQL can be employed to query RDF documents using RDF triples. OWL-DL ontologies are a subset of RDF and they are created by using specific OWL-DL expressions. Querying such ontologies using only RDF triples can be complicated and can produce a preventable source of error depending on each query.
SPARQL-DL Abstract Syntax (SPARQLAS) solves this problem using OWL Functional-Style Syntax or a syntax similar to the Manchester Syntax for setting up queries. SPARQLAS is a proper subset of SPARQL and uses only the essential constructs to obtain the desired results to queries on OWL-DL ontologies implying least possible effort in writing.
Due to the decrease in size of the query and having a familiar syntax the user is able to rely on, complex and nested queries on OWL-DL ontologies can be more easily realized. The Eclipse plugin EMFText is utilized for generating the specific SPARQLAS syntax. For further implementation of SPARQLAS, an ATL transformation to SPARQL is included as well. This transformation saves developing a program to directly process SPARQLAS queries and supports embedding SPARQLAS into running development environments.