14. The system of claim 12 , wherein the attribute of the document comprises a first field containing a name of the attribute and a second field containing a value of the attribute.
14. The system of claim 12 , wherein the attribute of the document comprises a first field containing a name of the attribute and a second field containing a value of the attribute. 15. The system of claim 14 , wherein said one or more metadata rules comprises a target name, a target value, a comparison operation for comparing the target value with the second field of the attribute the first field of which matches the target name, and the security access policy, comprising a permission set to be applied to the document for controlling access to the document based on results of the comparison operation.