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- Charset_detection abstract "Character encoding detection, charset detection, or code page detection is the process of heuristically guessing the character encoding of a series of bytes that represent text. The technique is recognised to be unreliable and is only used when specific metadata, such as a HTTP Content-Type: header is either not available, or is assumed to be untrustworthy.This algorithm usually involves statistical analysis of byte patterns, like frequency distribution of trigraphs of various languages encoded in each code page that will be detected; such statistical analysis can also be used to perform language detection. This process is not foolproof because it depends on statistical data.One of the few cases where charset detection works reliably is detecting UTF-8. This is due to the large percentage of invalid byte sequences in UTF-8, so that text in any other encoding that uses bytes with the high bit set is extremely unlikely to pass a UTF-8 validity test. Unfortunately, badly written charset detection routines do not run the reliable UTF-8 test first, and may decide that UTF-8 is some other encoding.UTF-16 is fairly reliable to detect due to the high number of newlines (U+000A) and spaces (U+0020) that should be found when dividing the data into 16-bit words. This process is not foolproof; for example, some versions of the Windows operating system would mis-detect the phrase \"Bush hid the facts\" (without a newline) in ASCII as Chinese UTF-16LE.Charset detection is particularly unreliable in Europe, in an environment of mixed ISO-8859 encodings. These are closely related eight-bit encodings that share an overlap in their lower half with ASCII. There is no technical way to tell these encodings apart and recognising them relies on identifying language features, such as letter frequencies or spellings.Due to the unreliability of heuristic detection, it is better to properly label datasets with the correct encoding. HTML documents served across the web by HTTP should have their encoding stated out-of-band using the Content-Type: header.Content-Type: text/html;charset=UTF-8An isolated HTML document, such as one being edited as a file on disk, may imply such a header by a meta tag within the file:or with a new meta type in HTML5If the document is Unicode, then some UTF encodings explicitly label the document with an embedded initial byte order mark (BOM).".
- Charset_detection wikiPageExternalLink chsdet.sourceforge.net.
- Charset_detection wikiPageExternalLink usage.shtml.
- Charset_detection wikiPageExternalLink jchardet.sourceforge.net.
- Charset_detection wikiPageExternalLink aa920101.aspx.
- Charset_detection wikiPageExternalLink chardet.html.
- Charset_detection wikiPageExternalLink appb.pdf.
- Charset_detection wikiPageExternalLink ucsdet_8h.html.
- Charset_detection wikiPageExternalLink hebci.
- Charset_detection wikiPageID "19263080".
- Charset_detection wikiPageLength "4024".
- Charset_detection wikiPageOutDegree "18".
- Charset_detection wikiPageRevisionID "680243860".
- Charset_detection wikiPageWikiLink ASCII.
- Charset_detection wikiPageWikiLink Browser_sniffing.
- Charset_detection wikiPageWikiLink Bush_hid_the_facts.
- Charset_detection wikiPageWikiLink Byte_order_mark.
- Charset_detection wikiPageWikiLink Category:Character_encoding.
- Charset_detection wikiPageWikiLink Character_encoding.
- Charset_detection wikiPageWikiLink Digraphs_and_trigraphs.
- Charset_detection wikiPageWikiLink Heuristic.
- Charset_detection wikiPageWikiLink Hypertext_Transfer_Protocol.
- Charset_detection wikiPageWikiLink IEC_8859.
- Charset_detection wikiPageWikiLink International_Components_for_Unicode.
- Charset_detection wikiPageWikiLink Language_identification.
- Charset_detection wikiPageWikiLink Metadata.
- Charset_detection wikiPageWikiLink Microsoft_Windows.
- Charset_detection wikiPageWikiLink Out-of-band_data.
- Charset_detection wikiPageWikiLink UTF-16.
- Charset_detection wikiPageWikiLink UTF-8.
- Charset_detection wikiPageWikiLinkText "Charset detection".
- Charset_detection wikiPageWikiLinkText "character encoding detection".
- Charset_detection wikiPageWikiLinkText "charset detection".
- Charset_detection wikiPageUsesTemplate Template:Character_encoding.
- Charset_detection wikiPageUsesTemplate Template:Reflist.
- Charset_detection subject Category:Character_encoding.
- Charset_detection hypernym Process.
- Charset_detection type Election.
- Charset_detection type Datum.
- Charset_detection type Encoding.
- Charset_detection comment "Character encoding detection, charset detection, or code page detection is the process of heuristically guessing the character encoding of a series of bytes that represent text.".
- Charset_detection label "Charset detection".
- Charset_detection sameAs Q5086691.
- Charset_detection sameAs m.04lf0c3.
- Charset_detection sameAs Q5086691.
- Charset_detection sameAs 字符集探测.
- Charset_detection wasDerivedFrom Charset_detection?oldid=680243860.
- Charset_detection isPrimaryTopicOf Charset_detection.