This paper describes an approach to indexing texts by their conceptual content using ontologies along with lexico-syntactic information and semantic role assignment provided by lexical resources. The conceptual content of meaningful chunks of text is transformed into conceptual feature structures and mapped into concepts in a generative ontology. Synonymous but linguistically quite distinct expressions are mapped to the same concept in the ontology. This allows us to perform a content-based search which will retrieve relevant documents independently of the linguistic form of the query as well as the documents.
Andreasen, T., Bulskov, H., Lassen, T., & Jensen, P. A. (2011). Extracting Conceptual Feature Structures from Text. Lecture Notes in Computer Science, 6804, 396-406. https://doi.org/10.1007/978-3-642-21916-0_43