A semantic best-effort approach for extracting structured discourse graphs from wikipedia

Most information extraction approaches available today have either focused on the extraction of simple relations or in scenarios where data extracted from texts should be normalized into a database schema or ontology. Some relevant information present in natural language texts, however, can be irregular, highly contextualized, with complex seman- Tic dependency relations, poorly structured, and intrinsically ambiguous. These characteristics should also be supported by an information extrac- Tion approach. To cope with this scenario, this work introduces a seman- Tic best-effort information extraction approach, which targets an infor- mation extraction scenario where text information is extracted under a pay-as-you-go data quality perspective, trading high-accuracy, schema consistency and terminological normalization for domain-independency, context capture, wider extraction scope and maximization of the text semantics extraction and representation. A semantic information ex- Traction framework (Graphia) is implemented and evaluated over the Wikipedia corpus.