一种扩展关键词的RDF模糊查询方法

retrieval method of extending keywords in RDF (resource description framework) fuzzy query is proposed for the issues of litera type RDF fuzzy query. It extends SPARQL through adding the fuzzy conditions in FILTER clause, and then SPARQL gets the expression ability of fuzzy query. The calculation formula of word distance is defined. It makes the word distance as the semantic similarity parameters, and the degrees of semantic similarity can be calculated by primaries combination. The words that get the semantic similarity degrees greater than 0.5 can be regarded as extending keywords through calling the mapping function, and the query conditions with extending keywords realize the fuzzy conditions conversion. The existing SPARQL query engine processes the RDF fuzzy query. The experimental system verifies the availability of the proposed method.