Knowledge (XXG)

Media type

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All media types should be registered using the IANA registration procedures. For the efficiency and flexibility of the media type registration process, different structures of subtypes can be registered in registration trees that are distinguished by the use of tree prefixes. Currently the following
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Suffix is an augmentation to the media type definition to additionally specify the underlying structure of that media type, allowing for generic processing based on that structure and independent of the exact type's particular semantics. Media types that make use of a named structured syntax should
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Mailcap (derived from the phrase "mail capability") is a type of meta file used to configure how MIME-aware applications such as mail clients and web browsers render files of different MIME-types. The mailcap format is defined by RFC 1524 "A User Agent Configuration Mechanism for Multimedia Mail
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The terms "vendor" and "producer" are considered equivalent in the context. Industry consortia as well as non-commercial entities can register media types in the vendor tree. A registration in the vendor tree may be created by anyone who needs to interchange files associated with some software
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product or set of products. However, the registration belongs to the vendor or organization producing the software that employs the type being registered, and that vendor or organization can at any time elect to assert ownership of a registration done by a third party.
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prefix, but discouraged use of the unregistered tree, as new personal and vendor trees with relaxed registration requirements are now available. The current RFC 6838 (published in January 2013) maintains the same recommendation, but subtypes prefixed with
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allows one to fall back on the extension in these cases. Similarly, since many file systems do not store MIME type information, but instead rely on the filename extension, a mime.types file is frequently used by web servers to determine MIME type.
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S. Rzepa, Henry; Murray-Rust, Peter; J. Whitaker, Benjamin (14 August 1998). "The Application of Chemical Multipurpose Internet Mail Extensions (Chemical MIME) Internet Standards to Electronic Mail and World Wide Web Information Exchange".
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A subtype typically consists of a media format, but it may or must also contain other content, such as a tree prefix, producer, product or suffix, according to the different rules in registration trees.
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for that structured syntax when they are registered. Unregistered suffixes should not be used (since January 2013). Structured syntax suffix registration procedures are defined in RFC 6838.
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Types, subtypes, and parameter names are case-insensitive. Parameter values are usually case-sensitive, but may be interpreted in a case-insensitive fashion depending on the intended use.
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Registrations in the standards tree must be either associated with IETF specifications approved directly by the IESG, or registered by an IANA recognized standards-related organization.
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and the format is simply that each line is a space-delimited list of a MIME type, followed by zero or more extensions. For example, the HTML type can be associated with the extensions
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The unregistered tree includes media types intended exclusively for use in private environments and only with the active agreement of the parties exchanging them. It uses the
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use the term "media type", and consider the term "MIME type" to be obsolete, since media types have become used in contexts unrelated to email, such as HTTP. By contrast, the
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HTTP uses media types in the Content-Type (Section 8.3) and Accept (Section 12.5.1) header fields in order to provide open and extensible data typing and type negotiation.
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continues to use the term "MIME type" and discourages use of the term "media type" as ambiguous, since it is used with a different meaning in connection with the
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suffix has been defined since January 2001 (RFC 3023), and was formally included in the initial contents of the Structured Syntax Suffix Registry along with
1005:#--Netscape Communications Corporation MIME Information # Do not delete the above line. It is used to identify the file type. type=text/html exts=htm,html 471:
prefix). These registration trees were first defined in November 1996 (obsoleted RFC 2048 - currently RFC 6838). New registration trees may be created by
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The personal or vanity tree includes media types associated with non publicly available products or experimental media types. It uses the
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is the official authority for the standardization and publication of these classifications. Media types were originally defined in
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Standards Action for external registration and management by well-known permanent organizations (e.g. scientific societies).
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specifies that Media Types (formerly known as MIME types) and Media Subtypes will be assigned and listed by the IANA.
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Different internet standards or web standards bodies differ on the preferred term for this type of identifier.
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Lines can be comments starting with the # character, or a mime-type followed by how to handle that mime type.
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The "type" part defines the broad use of the media type. As of November 1996, the registered types were:
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Format Information" but is not defined as an Internet standard. It is supported by most Unix systems.
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Standards are encouraged to consistently use the term MIME type to avoid confusion with the use of
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The vendor tree includes media types associated with publicly available products. It uses the
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consisting of a specific comment that identifies the file as a mime.types file, as follows:
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Please expand the section to include this information. Further details may exist on the
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This type was originally defined in RFC 1590 (published in September 1993) using the
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is an example of a widely deployed type that ended up registered with the
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application/vnd.openxmlformats-officedocument.presentationml.presentation
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Media types that have been widely deployed (with a subtype prefixed with
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application/vnd.openxmlformats-officedocument.wordprocessingml.document
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The Python Standard Library | mimetypes — Map filenames to MIME types
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application/vnd.openxmlformats-officedocument.spreadsheetml.sheet
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Nielsen, Henrik; Fielding, Roy T.; Berners-Lee, Tim (May 1996).
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In UNIX-type systems, the mime.types file is usually located at
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The standards tree does not use any tree prefix. Examples are
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prefix. RFC 2048 (published in November 1996) introduced the
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is an optional parameter indicating the character encoding.
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and a comma-separated list of extensions, together with a
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message content and attachments; hence the original name,
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in January 2013 (RFC 6839). Subsequent additions include
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are no longer considered to be members of this tree.
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Media types in this tree cannot be registered. 459:trees are created: standard (no prefix), vendor ( 1137: 1135: 908:associates an extension with a MIME type, while 306:As an example, an HTML file might be designated 215:response header for providing the media type is 380:An unofficial top-level type in common use is 1422: 1420: 711:application/vnd.microsoft.portable-executable 8: 1458:IETF Request for Comments (RFC) Pages - Test 1355:Journal of Chemical Information and Modeling 994:, where it used a different format; it used 902:a file, these two work together as follows: 57:. There might be a discussion about this on 1234:Freed, N.; Borenstein, N. (November 1996). 1447: 1445: 134:Internet Assigned Numbers Authority (IANA) 1361:(6). American Chemical Society: 976–982. 1304:Daniel Leidert, Egon Willighagen (2007). 1262:"Hypertext Transfer Protocol -- HTTP/1.0" 1229: 1227: 1225: 1204: 1202: 1200: 1147:XHTML Modularization 1.1 - Second Edition 1105: 91:information and communications technology 77:Learn how and when to remove this message 247:Syntax notations in this section are in 1035: 914:associates a MIME type with a program. 729:application/vnd.oasis.opendocument.text 512:application/vnd.oasis.opendocument.text 266:. A media type can optionally define a 152:(Multipurpose Internet Mail Extensions) 1047: 1045: 1043: 1041: 1039: 239:continue to use the term "MIME type". 262:, which is further structured into a 7: 1428:"Table 10: Standard MIME type icons" 610:use the appropriate IANA registered 235:specifications implemented by Linux 174:specifications implemented by Linux 154:specification, for denoting type of 1526:"Structured Syntax Suffix Registry" 1155:ContentType: A media type, as per . 791:(.jpg, .jpeg, .jfif, .pjpeg, .pjp) 25: 1586:IANA list of official media types 753:application/x-www-form-urlencoded 595:application/x-www-form-urlencoded 402:other than normal files, such as 394:, the unofficial top-level types 113:. Their purpose is comparable to 1403:"2.14 Content types for volumes" 1306:"The chemical-mime-data project" 954: 166:, document file formats such as 34: 1240:Internet Engineering Task Force 1172:"4.1. MIME type representation" 1407:Shared MIME Info Specification 1385:Shared MIME Info Specification 1: 990:The mime.types file dates to 723:application/vnd.ms-powerpoint 463:prefix), personal or vanity ( 105:is a two-part identifier for 444:office productivity software 506:tree prefix. Examples are: 254:A media type consists of a 251:, following RFC convention. 27:Identifier for file formats 1658: 1500:Kohn, Dan (January 2001). 1452:Freed, N. (January 2013). 878:An associated file is the 859: 550:tree prefix. Examples are 530:tree prefix. Examples are 390:. In the context of Linux 246: 1432:Icon Naming Specification 1381:"2.13. Non-regular files" 1331:"Chemical MIME Home page" 1283:"HTML 4.01 Specification" 942:text/html htm html 249:Extended Backus–Naur form 888:application/octet-stream 717:application/vnd.ms-excel 706:application/vnd.api+json 669:From the IANA registry: 508:application/vnd.ms-excel 308:text/html; charset=UTF-8 278: 178:, for similar purposes. 119:uniform type identifiers 1210:"shared-mime-info-spec" 939:by the following line: 522:Personal or vanity tree 467:prefix), unregistered ( 442:(generic categories of 231:name for a media type. 1176:MIME Sniffing Standard 1143:"4.3. Attribute Types" 965:is missing information 404:filesystem directories 1620:Computer file formats 1615:Internet architecture 388:chemical file formats 446:document) are used. 392:desktop environments 318:is the subtype, and 237:desktop environments 176:desktop environments 138:Request for Comments 47:confusing or unclear 1552:. 18 December 2023. 1170:Hemsley, Gordon P. 1100:. sec. 8.3.1. 1015:Content negotiation 818:multipart/form-data 680:application/ld+json 612:"+"suffix 428:DCF digital cameras 424:x-content/image-dcf 310:. In this example, 125:, and also used on 115:filename extensions 55:clarify the article 18:Internet media type 1640:1996 introductions 1531:. IANA. 2012-07-20 1333:. 22 December 1998 1025:Filename extension 713:(.efi, .exe, .dll) 690:application/msword 1596:Common MIME types 1502:"XML Media Types" 1367:10.1021/ci9803233 988: 987: 552:application/x.foo 542:Unregistered tree 87: 86: 79: 16:(Redirected from 1647: 1574: 1560: 1554: 1553: 1546: 1540: 1539: 1537: 1536: 1530: 1522: 1516: 1515: 1513: 1512: 1497: 1491: 1490: 1483: 1477: 1476: 1474: 1472: 1449: 1440: 1439: 1424: 1415: 1414: 1399: 1393: 1392: 1377: 1371: 1370: 1349: 1343: 1342: 1340: 1338: 1327: 1321: 1320: 1318: 1317: 1308:. Archived from 1301: 1295: 1294: 1292: 1290: 1279: 1273: 1272: 1270: 1268: 1257: 1251: 1250: 1248: 1246: 1231: 1220: 1219: 1206: 1195: 1194: 1188:as described in 1167: 1158: 1157: 1139: 1130: 1129: 1109: 1107:10.17487/rfc9110 1087: 1076: 1075: 1070: 1068: 1049: 1020:Content sniffing 983: 980: 974: 958: 950: 938: 934: 930: 923: 913: 906: 889: 862:File association 850: 844: 839: 834: 829: 824: 819: 813: 807: 801: 796: 790: 785: 780: 775: 769: 768:application/zstd 764: 759: 754: 748: 742: 736: 730: 724: 718: 712: 707: 702: 697: 691: 681: 676: 675:application/json 660: 656: 652: 648: 644: 640: 636: 632: 628: 624: 613: 600: 596: 592: 588: 581: 577: 572: 568: 564: 557: 553: 549: 537: 533: 529: 513: 509: 505: 490: 486: 470: 466: 462: 441: 433: 425: 417: 397: 384: 376: 372: 368: 364: 360: 356: 352: 348: 344: 340: 336: 321: 317: 313: 309: 300: 297: 294: 291: 288: 285: 282: 226: 218: 207: 82: 75: 71: 68: 62: 38: 37: 30: 21: 1657: 1656: 1650: 1649: 1648: 1646: 1645: 1644: 1605: 1604: 1582: 1577: 1561: 1557: 1548: 1547: 1543: 1534: 1532: 1528: 1524: 1523: 1519: 1510: 1508: 1499: 1498: 1494: 1485: 1484: 1480: 1470: 1468: 1451: 1450: 1443: 1436:freedesktop.org 1426: 1425: 1418: 1411:freedesktop.org 1401: 1400: 1396: 1389:freedesktop.org 1379: 1378: 1374: 1351: 1350: 1346: 1336: 1334: 1329: 1328: 1324: 1315: 1313: 1303: 1302: 1298: 1288: 1286: 1281: 1280: 1276: 1266: 1264: 1259: 1258: 1254: 1244: 1242: 1233: 1232: 1223: 1215:freedesktop.org 1208: 1207: 1198: 1169: 1168: 1161: 1141: 1140: 1133: 1089: 1088: 1079: 1066: 1064: 1051: 1050: 1037: 1033: 1011: 1006: 1000:standard header 996:key–value pairs 984: 978: 975: 968: 967:about Netscape. 959: 948: 943: 925: 918: 909: 876: 864: 858: 853: 843:text/javascript 763:application/zip 758:application/xml 701:application/sql 696:application/pdf 667: 665:Common examples 607: 544: 524: 500: 485:text/javascript 481: 452: 436:package manager 420:removable media 331: 302: 301: 298: 295: 292: 289: 286: 283: 280: 252: 245: 184: 111:content formats 83: 72: 66: 63: 52: 39: 35: 28: 23: 22: 15: 12: 11: 5: 1655: 1654: 1651: 1643: 1642: 1637: 1632: 1627: 1622: 1617: 1607: 1606: 1603: 1602: 1593: 1588: 1581: 1580:External links 1578: 1576: 1575: 1569:2000-12-07 at 1555: 1541: 1517: 1506:tools.ietf.org 1492: 1478: 1441: 1416: 1394: 1372: 1344: 1322: 1296: 1274: 1252: 1221: 1196: 1159: 1153:. 2010-07-29. 1131: 1118:. 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Index

Internet media type
confusing or unclear
clarify the article
the talk page
Learn how and when to remove this message
information and communications technology
file formats
content formats
filename extensions
uniform type identifiers
Internet
Linux desktop
Internet Assigned Numbers Authority (IANA)
Request for Comments
RFC
2045
MIME
email
HTTP
HTML
XDG
desktop environments
IANA
IETF
WHATWG
CSS
HTTP
W3C
XML data-type
XDG

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