With this approach, users can easily specify retrieval conditions which will be complicated when expressed in Boolean expressions of keywords. We heve built a prototype system, and did experiments using a small set of documents. Digital Library, Information Retrieval, Information Filtering, Visualisation 1. Recently, much attention has been paid to visual user interface for document retrieval. This is mainly because such user interface is deemed to be a promising method to overcome the limitations of systems using keyword interface.
Users can specify queries in visual and intuitive manner.
Specification of such relationships among documents would be very complicated if Boolean combinations of keywords were used. Unlike many other systems, users can specify 2-D planes on which documents are placed. To specify horizontal and vertical axes of planes, users give two pairs of documents which are familiar to them. Therefore, users can view and retrieve documents from their own point of view. So far, much work have been done on information retrieval using vector model, in which objects near to the specified query vector are retrieved.