During policy lifecycle some policy analysis is needed, especially at the definition level, so administrators can know if their policy definitions are inconsistent or not with some previously defined policy rules, which may already be applied to the end devices. This paper provides one step towards the objective of detecting conflicts in the specification of security policies. The context for such research is the deployment of a semantically-rich checking component based on the use of ontology and rule-based reasoning able to detect any inconsistency that may exist in a set of policy rules when applying them in a target system.