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external data representation wikipedia 503 captures 20 jun 2004 16 sep 2026 oct nov dec 29 2021 2022 2023 success fail about this capture timestamps the wayback machine http web archive org web 20221129081155 https en wikipedia org wiki external_data_representation external data representation from wikipedia the free encyclopedia jump to navigation jump to search data serialization format this article has multiple issues please help improve it or discuss these issues on the talk page learn how and when to remove these template messages this article includes a list of general references but it lacks sufficient corresponding inline citations please help to improve this article by introducing more precise citations february 2017 learn how and when to remove this template message this article needs additional citations for verification please help improve this article by adding citations to reliable sources unsourced material may be challenged and removed find sources external data representation news newspapers books scholar jstor february 2017 learn how and when to remove this template message learn how and when to remove this template message osi model by layer 7 application layer nntp sip ssi dns ftp gopher http nfs ntp smpp smtp snmp telnet dhcp netconf more 6 presentation layer mime xdr asn 1 ascii pgp 5 session layer named pipe netbios sap pptp rtp socks x 225 1 4 transport layer tcp udp sctp dccp spx 3 network layer ip ipv4 ipv6 icmp ipsec igmp ipx is is appletalk x 25 plp 2 data link layer atm arp sdlc hdlc cslip slip gfp plip ieee 802 2 llc mac l2tp ieee 802 3 frame relay itu t g hn dll ppp x 25 lapb q 922 lapf 1 physical layer rs 232 rs 449 itu t v series i 430 i 431 pdh sonet sdh pon otn dsl ieee 802 3 ieee 802 11 ieee 802 15 ieee 802 16 ieee 1394 itu t g hn phy usb bluetooth v t e 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 contents 1 history 2 xdr data types 3 see also 4 references 5 external links history edit xdr was developed in the mid 1980s at sun microsystems and first widely published in 1987 2 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 stellar payment network xdr data types edit boolean int 32 bit integer unsigned int unsigned 32 bit integer hyper 64 bit integer unsigned hyper unsigned 64 bit integer ieee float ieee double quadruple new in rfc1832 enumeration structure string fixed length array variable length array union discriminated union fixed length opaque data variable length opaque data void zero byte quantity optional optional data is notated similarly to c pointers but is represented as the data type pointed to with a boolean present or not flag semantically this is option type see also edit structured data exchange format sdxf remote procedure call abstract syntax notation one data format description language comparison of data serialization formats references edit x 225 information technology open systems interconnection connection oriented session protocol protocol specification archived from the original on 1 february 2021 retrieved 24 november 2021 sun microsystems 1987 xdr external data representation standard rfc 1014 network working group retrieved july 11 2011 external links edit the xdr standard exists in three different versions in the following rfcs rfc 4506 2006 this document makes no technical changes to rfc 1832 and is published for the purposes of noting iana considerations augmenting security considerations and distinguishing normative from informative references rfc 1832 1995 version added quadruple precision floating point to rfc 1014 cisco s xdr technical notes jsxdrapi c the main source file of spidermonkey that uses xdr protocol cpp main xdr source file used in firebird remote protocol the gnu libc implementation of rpcgen the xdr parser mu dynamics research labs racc grammar for xdr ivmaiasn asn1 ecn xdr tools a collection of tools containing an xdr rpc to asn 1 converter v t e data exchange formats human readable formats atom csv edifact json web encryption web token web signature property list rdf rebol toml xml yaml binary formats amf asn 1 smi avro base32 base64 bson ubjson cap n proto cbor flatbuffers messagepack property list protocol buffers thrift cyphal dsdl xdr uuencode yenc comparison of data serialization formats retrieved from https en wikipedia org w index php title external_data_representation oldid 1060459963 categories networking standards internet standards internet protocols data modeling languages data serialization formats data transmission sun microsystems software hidden categories articles with short description short description is different from wikidata articles lacking in text citations from february 2017 all articles lacking in text citations articles needing additional references from february 2017 all articles needing additional references articles with multiple maintenance issues navigation menu personal tools not logged in talk contributions create account log in namespaces article talk english views read edit view history more navigation main page contents current events random article about wikipedia contact us donate contribute help learn to edit community portal recent changes upload file tools what links here related changes upload file special pages permanent link page information cite this page wikidata item print export download as pdf printable version languages deutsch español français 日本語 norsk bokmål polski português русский suomi українська 中文 edit links this page was last edited on 15 december 2021 at 17 24 utc text is available under the creative commons attribution sharealike license 3 0 additional terms may apply by using this site 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