---
title: "A Distributed Case-Based Query Rewriting"
authors:
  - "Maurizio Panti"
  - "Luca Spalazzi"
  - "Loris Penserini"
doi: ""
url: "https://ijcai.org/proceedings/2001/136"
pdf: "https://ijcai.org/proceedings/2001/0136.pdf"
venue: "Proceedings of the Seventeenth International Joint Conference on Artificial Intelligence"
year: 2001
pages: "1005-1009"
track: ""
keywords:
---

# A Distributed Case-Based Query Rewriting

Maurizio Panti, Luca Spalazzi, Loris Penserini

*Proceedings of the Seventeenth International Joint Conference on Artificial Intelligence*, pages 1005-1009.

## Abstract

In literature, the mediator architecture has been proposed for taking information from distributed, heterogeneous, and often dynamic sources and making them work together as a whole. In this paper we propose a distributed case-based approach for the main problem of a mediator, i.e. rewriting queries according to mediator’s schema. According to this approach we use a case memory as mediator’s schema. Therefore, such a schema is not static (as in other systems) but is dynamically updated through the cooperation with information sources and other mediators, strongly influenced by the queries submitted by a consumer. From the analysis of different cooperation strategies arises that it is more efficient and effective for a mediator to directly cooperate with information sources, when the sources are few. Otherwise, it is more efficient to cooperate with other mediators.