The Extensible Markup Language (XML) is becoming the most popular format for information representation and data exchange. Much research has been done in providing flexible query facilities while aiming at efficient techniques to extract data from XML documents. However, most are focused on only the exact matching of query conditions. In this paper, we describe a cooperative
XML query answering system, CoXML, which cooperates with the users by extending query relaxation techniques and provides approximate matching of query conditions. We also present our participation effort in the Initiative for the Evaluation of XML Retrieval (INEX) with CoXML.