- It is necessary to develop tools by which the queries with natural language from users
are automatically transformed into the formats of the query language exploited
Ontology Layer
- Ontology editors refer to the system for loading, editing, and storing ontologies.
Prot?©g?©-2000 (Noy et al., 2001) and OntoEdit are typical GUI-based ontology editors.
- Inference engine is a core component of the ontology layer and is used for several
tasks like semantic validation and deduction of implicit information. Description
Logics (DL) is exploited in reasoning support in OWL.
- Ontology layer needs several sets of interfaces such as ontology API ensuring
independence between usage and storage of ontologies and APIs for integrating with
Web Services or existing KM systems.
- It is important to develop the tools for mapping or merging ontologies (Noy & Musen,
2004).
Metadata Layer
- Metadata layer needs components to edit, store, and manage RDFs as metadata. The
component should have the ability to test validation of RDF models. RDF/XML parser
plays a role as a core component in the metadata layer.
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