Online information retrieval: concepts, principles, and techniques
Online information retrieval: concepts, principles, and techniques
Improving automatic query expansion
Proceedings of the 21st annual international ACM SIGIR conference on Research and development in information retrieval
Question-answering by predictive annotation
SIGIR '00 Proceedings of the 23rd annual international ACM SIGIR conference on Research and development in information retrieval
A formal study of information retrieval heuristics
Proceedings of the 27th annual international ACM SIGIR conference on Research and development in information retrieval
Why structural hints in queries do not help XML-retrieval
SIGIR '06 Proceedings of the 29th annual international ACM SIGIR conference on Research and development in information retrieval
Structured retrieval for question answering
SIGIR '07 Proceedings of the 30th annual international ACM SIGIR conference on Research and development in information retrieval
A generative retrieval model for structured documents
Proceedings of the 17th ACM conference on Information and knowledge management
CIKM '10 Proceedings of the 19th ACM international conference on Information and knowledge management
Hybrid search ranking for structured and unstructured data
ESWC'11 Proceedings of the 8th extended semantic web conference on The semanic web: research and applications - Volume Part II
Automatic term mismatch diagnosis for selective query expansion
SIGIR '12 Proceedings of the 35th international ACM SIGIR conference on Research and development in information retrieval
Rewarding term location information to enhance probabilistic information retrieval
SIGIR '12 Proceedings of the 35th international ACM SIGIR conference on Research and development in information retrieval
Estimating structural relevance of XML elements through language model
Proceedings of the 10th Conference on Open Research Areas in Information Retrieval
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Search engines that support structured documents typically support structure created by the author (e.g., title, section), and may also support structure added by an annotation process (e.g., part of speech, named entity, semantic role). Exploiting such structure can be difficult. Query structure may fail to match structure in a relevant document for a variety of reasons, thus structured queries, although containing more information than keyword queries, are often less effective than unstructured queries. This paper studies retrieval of sentences with annotations for a question answering task. Three problems of structured retrieval are identified and solutions proposed. Structural mismatch is addressed by query structure expansion of predicted relevant structures. Lack of presence of all key aspects of a question is solved by Boolean filtering of result sentences. The score variations of the annotator generated fields with all the different lengths are accounted for by using field specific smoothing. Experiments show that each solution incrementally improves structured retrieval, and a combination of Boolean filtering, structural expansion, and keyword queries outperforms keyword and simple structured retrieval baselines.