The evolution of Protégé: an environment for knowledge-based systems development
International Journal of Human-Computer Studies
Multimedia Annotations on the Semantic Web
IEEE MultiMedia
The semantic-document approach to combining documents and ontologies
International Journal of Human-Computer Studies
Integrating keywords and semantics on document annotation and search
OTM'10 Proceedings of the 2010 international conference on On the move to meaningful internet systems: Part II
Learning to annotate scientific publications
COLING '10 Proceedings of the 23rd International Conference on Computational Linguistics: Posters
GoNTogle: a tool for semantic annotation and search
ESWC'10 Proceedings of the 7th international conference on The Semantic Web: research and Applications - Volume Part II
Semantator: Semantic annotator for converting biomedical text to linked data
Journal of Biomedical Informatics
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Document annotation is a common technique for relating text and knowledge representation. Although the semantic web emphasizes the annotation of web pages, there are other types of documents that can benefit from ontology-based annotations. PDF documents combined with OWL ontologies form semantic documents that support professional printing, on-line viewing, and ontological models. PDFTab is an extension to the Protégé ontology editor that allows developers to annotate PDF documents with OWL-based ontologies. It is possible to add OWL ontologies to preexisting PDF documents and to relate document parts to concepts in the ontology. PDFTab integrates Adobe Acrobat with Protégé and allows users to switch seamlessly between the document and ontology views. PDFTab illustrates how it is possible to extend semantic-web techniques to the widely-used PDF format while maintaining strong support for ontology development and editing.