<span lang="en">The communication is very important in our society. As the need of controling the information interchange increases, data capture system has been implemented. Analysing data can provide essential information like intrusion detection, quality of service statistics, accounting… These scopes are differents so a unified language facilitates to compose rules and to interchange them with other systems. XML (Extensible Markup Language) tags are defined to create a large number of differents and complex rules. Then it was developed a parser which load in memory these rules.</span>