Descriptive Schema: Semantics-based Query Answering
Thomas K. Lee, KC Yee, Dwl Cheung, Wenjun Yuan · 2008
Abstract. We propose the novel concept of “descriptive schema ” (DS). Unlike ordinary database schemas, a DS does not restrict the structure of the underlying database. Rather, it is just a probabilistic description of the structure. When answering keyword queries, DS can be used to improve semantics-based query answering and result ranking. 1 Schema: To have or not to have? Wikipedia is a rich repository of information. However, facilities to exploit the information are still limited. Although typical search WWW search engines such as Google[1] allow users to look for information using keywords, they lack a schema for formulating the queries precisely. Besides hyperlinks among the Wikipedia pages, many pages have Category tags as well as Infoboxes, which can be exploited to perform more sophisticated searches. For example, the DBpedia community makes use of these tags to build a database of RDF triplets, allowing more expressive and precise queries in the form of SPARQL to be used to retrieve useful information [2].