The fuzzy database model is based on the database relational one with the aim of expanding the ability to present and manipulate incomplete and uncertain data. There has been no storing and handling data model assisting in deploying the application in practice so far. In this paper, the authors describe a method of fuzzy database presentation with XML that is based on the hedge algebra. Thanks to the presentation of fuzzy database with XML, the authors develop algorithms to calculate and query on the fuzzy database. This result allowed us to collect, store data and perform fuzzy queries on it
it was then developed for the calculation and extraction of knowledge from fuzzy database by fuzzy data presentation with XML.