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

Figure 15. Template-based transformation
General Adaptat on Framework
cording to its schema. Depending on a canonical XML document, some branches of
the RSCDF graph have the same structure and could be cloned while processing.
On the other hand, the tag templates correspond to the RSCDF classes. In fact, tag
template represents some classes from RSCDF schema; for example, SR_Statement,
Context_SR_Container, SR_Container, NumericalValue, TempTempMark. Tag templates
are “bricks,” which are used by the adapter to produce the RSCDF document.
Tag template has a body and a changing part, which can have different types:
• Link to other tag template
• Link to XML data
• Link to ontology data
• Generated value
Figure 15 represents an example of the tag template. The variable Xn is obtained
during a run-time either from ontology or the XML file, or generated by the generator.
The variable Yn is obtained from the identifier of from some other template.
This means that if an RSCDF tag depends on some other RSCDF tag, then it will
be generated after the latter one. In this way, the adapter recursively calls methods
of template creation until it will reach the leaf nodes.
Using tag and structural templates, the device adapter performs semantic transformation.
This approach provides a possible way to implement the logic of semantic
transformation from canonical XML to RSCDF format.
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