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External Data Representation (XDR) is a standard data serialization format, for uses such as computer network protocols. It allows data to be transferred between different kinds of computer systems. Converting from the local representation to XDR is called ''encoding''. Converting from XDR to the local representation is called ''decoding''. XDR is implemented as a software library of functions which is portable between different operating systems and is also independent of the transport layer. XDR uses a base unit of 4 bytes, serialized in big-endian order; smaller data types still occupy four bytes each after encoding. Variable-length types such as string and opaque are padded to a total divisible by four bytes. Floating-point numbers are represented in IEEE 754 format. ==History== XDR was developed in the mid 1980s at Sun Microsystems, and first widely published in 1987. XDR became an IETF standard in 1995. The XDR data format is in use by many systems, including: * Network File System (protocol) * ZFS File System * NDMP Network Data Management Protocol * Open Network Computing Remote Procedure Call * Legato NetWorker backup software (later sold by EMC) * NetCDF (a scientific data format) * The R language and environment for statistical computing * The HTTP-NG Binary Wire Protocol * The SpiderMonkey JavaScript engine, to serialize/deserialize compiled JavaScript code * The Ganglia distributed monitoring system * The sFlow network monitoring standard * The libvirt virtualization library, API and UI *The Firebird (database server) for Remote Binary Wire Protocol 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「External Data Representation」の詳細全文を読む スポンサード リンク
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