#ONCRPCv2 and XDR grammars

External Data Representation (XDR) is a data serialization format defined by RFC 4506 (which obsoletes the previous definition in RFC 1832).

Open Network Computing Remote Procedure Call (ONCRPC) aka SunRPC is a remote procedure call system that uses XDR for serialization. version 2 is defined by RFC 5531

ONCRPC is the rpc mechanism that NFS (Network File System) is built on.