1. A method of retrieving documents, comprising: performing processing associated with coding, with a processor, a plurality of stored documents as respective document feature vectors in a bit-attribute matrix, each feature vector comprising at least one attribute or class; performing processing associated with generating, with the processor, a query vector based on a query document; performing processing associated with performing, with the processor, one or more logical operations between the query vector and the respective document feature vectors in the bit-attribute matrix to obtain respective similarity measures; and performing processing associated with assigning, with the processor, an attribute or class to the query document based on the attribute or classes of one or more of the feature vectors.
1. A method of retrieving documents, comprising: performing processing associated with coding, with a processor, a plurality of stored documents as respective document feature vectors in a bit-attribute matrix, each feature vector comprising at least one attribute or class; performing processing associated with generating, with the processor, a query vector based on a query document; performing processing associated with performing, with the processor, one or more logical operations between the query vector and the respective document feature vectors in the bit-attribute matrix to obtain respective similarity measures; and performing processing associated with assigning, with the processor, an attribute or class to the query document based on the attribute or classes of one or more of the feature vectors. 15. The method of claim 1 , wherein features coded by a feature vector for their presence or absence comprise one or more of the following; unigrams, diagrams, multigrams, words, fragments of text, sentences, paragraphs, or any combination thereof; semantic classes reflecting a certain meaning which elements in the text to be represented may have; concept classes reflecting an abstract concept to which elements in the text to be represented belong; a classification class classifying the document according to a classification scheme; an attribute which may be assigned to a document.