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Learn about the string metric that measures the difference between two sequences by the minimum number of edits. Find definitions, examples, applications, bounds, and algorithms for computing the Levenshtein distance.
CDATA is a term used to indicate that a portion of a document is general character data, not markup or entity references. Learn how to use CDATA sections in XML, their advantages and limitations, and how to encode them in different contexts.
UTF-16 is a variable-length encoding that can encode all 1,112,064 valid code points of Unicode with one or two 16-bit units. Learn about its history, description, and usage in different systems and applications.
Learn about the process of assigning numbers to graphical characters, especially the written characters of human language, allowing them to be stored, transmitted, and transformed using digital computers. Find out the history, examples, and common systems of character encoding, such as ASCII, Unicode, and UTF-8.
Learn about the non-breaking space character (U+00A0), which prevents automatic line breaks and whitespace collapse in text processing and digital typesetting. See its uses, variations, examples and encodings in Unicode and HTML.
Learn about the format, names, values, and functions of HTTP header fields, which are strings sent and received by client and server in every HTTP request and response. See examples of standard and non-standard header fields, and how they are used for content negotiation, authentication, compression, and more.
Learn how to specify and detect the character encoding of HTML documents, and which encodings are permitted by the HTML standards. The web page explains the difference between UTF-8, UTF-16, UTF-32, and other encodings, and their advantages and disadvantages.
UTF-32 uses four bytes per code point, but only the lowest 21 bits are significant. It has advantages for direct indexing and constant-time operations, but also disadvantages for space efficiency and rare characters.