In order to manage the knowledge representation of European law we have proposed the Legal Taxonomy Syllabus methodology (Ajani et al., 2007a; Ajani et al., 2007b). In this paper we apply such a methodology to a new issue, concerning the recasting of the Community legislation on contract law. In particular we show how to include in the knowledge representation system of the Legal Taxonomy Syllabus the Acquis Principles, which have been sketched by scholars in European Private Law from the so-called Acquis communautaire.