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Semantic Web-Based Information Systems: State-of-the-Art ...

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Figure 6. An example SimilarTo pattern<br />

<strong>Web</strong> Serv ce Messages<br />

<br />

<br />

<br />

SimilarTo_1<br />

(and (rdf:type ?x<br />

http://www.sample.org/openEHRweight-birth#Body_weight_at_birth)<br />

(state ?x ?y))<br />

<br />

...<br />

<br />

among <strong>the</strong> classes and properties <strong>of</strong> <strong>the</strong> source and target ontology. The patterns are<br />

also specified as OWL class instances in <strong>the</strong> Mapping Specification. As an example,<br />

SimilarTo pattern is shown in Figure 6.<br />

However, <strong>the</strong> use <strong>of</strong> OWL as a mapping definition language has some shortcomings,<br />

as stated in Brujin and Polleres (2004). One <strong>of</strong> <strong>the</strong> shortcomings <strong>of</strong> using OWL<br />

as a mapping definition language is its tight coupling between <strong>the</strong> source and <strong>the</strong><br />

target ontologies. A mapping definition needs to import o<strong>the</strong>r related (source and<br />

target) ontologies with owl:import. This results in a tight coupling between ontolo-<br />

Figure 7. Mapping object properties<br />

Copyright © 2007, Idea Group Inc. Copying or distributing in print or electronic forms without written permission<br />

<strong>of</strong> Idea Group Inc. is prohibited.

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