Data Interchange Protocols are used to transmit structured data between entities. These protocols are often specific to a particular domain (B2B: purchase orders, invoices, transport logistics and waybills, medical records). They are often, but not always, XML-based. Subverting the protocol can allow an adversary to impersonate others, discover sensitive information, control the outcome of a session, or perform other attacks. This type of attack targets invalid assumptions that may be inherent in implementers of the protocol, incorrect implementations of the protocol, or vulnerabilities in the protocol itself.