Pgr: A cooperative legal ir system on the web

In this paper we present a web based legal information retrieval system which is able to support cooperative interactions between users and a legal knowledge base. The legal knowledge base is composed by four levels of knowledge: Text knowledge; Domain knowledge; Information-retrieval knowledge; and Interaction Knowledge. The Text Level has knowledge about the words and sequence of words that are in each text of the knowledge base. The Domain level includes knowledge about the text domain such as juridical knowledge (for instance, under which conditions a pension for relevant services may be given to someone). It has rules that encoded the domain knowledge, such as: normally those pensions are attributed to militaries or to civilians (firemen, doctors, nurses, etc.) and the conditions to be fulfilled by them are different. The Information Retrieval Level includes knowledge about what we should expect to find in texts about a subject, for instance that in texts about pensions for relevant services, the pension may be attributed or refused. The Interaction level is responsible for the multimodal interaction management. This includes the ability of the system to infer user intentions and attitudes and to build the representation of the user interaction