1. A method comprising: determining, by a computer system, whether a first web service policy attached to a policy subject via a first policy attachment metadata file is identical to a second web service policy attached to the policy subject via a second policy attachment metadata file, wherein attachment of the first web service policy to the policy subject conflicts with attachment of the second web service policy to the policy subject according to one or more predefined rules; and if the first web service policy and the second web service policy are determined to be identical, causing, by the computer system, the first web service policy or the second web service policy to be enforced at the policy subject.