Represent the Policy Mappings Extension. This extension, if present, identifies the certificate policies considered identical between the issuing and the subject CA.
Extensions are addiitonal attributes which can be inserted in a X509 v3 certificate. For example a "Driving License Certificate" could have the driving license number as a extension.
Extensions are represented as a sequence of the extension identifier (Object Identifier), a boolean flag stating whether the extension is to be treated as being critical and the extension value itself (this is again a DER encoding of the extension value).
@author Amit Kapoor
@author Hemma Prafullchandra
@see Extension
@see CertAttrSet