3.3 Determination of document relevance in BIR
In order to determinate the relevance of a document to the query, the logical value of the query has to be evaluated. Each term in the query has a logical value 1 if the word exists in the document (or its representation) and logical value 0 if it does not. After all terms in the query are replaced by logical values, the query can be evaluated as any logic sentence. If the sentence is true then the document is considered relevant.