document: Hera presentation generator Semantic Web Information Systems ( SWIS ) are Web Information Systems that use Semantic Web technologies . Hera is a model-driven design methodology for SWIS . In Hera , models are represented in RDFS and model instances in RDF . The Hera Presentation Generator ( HPG ) is an integrated development environment that supports the presentation generation layer of the Hera methodology . The HPG is based on a pipeline of data transformations driven by different Hera models .
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