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YAML
YAML (, rhymes with ''camel'') is a human-readable data serialization format that takes concepts from programming languages such as C, Perl, and Python, and ideas from XML and the data format of electronic mail (RFC 2822). YAML was first proposed by Clark Evans in 2001, who designed it together with Ingy döt Net and Oren Ben-Kiki.〔 It is available for several programming languages.
''YAML'' is a recursive acronym for "YAML Ain't Markup Language". Early in its development, ''YAML'' was said to mean "Yet Another Markup Language", but it was then reinterpreted (backronyming the original acronym) to distinguish its purpose as data-oriented, rather than document markup.
==Features==
YAML syntax was designed to be easily mapped to data types common to most high-level languages:
list, associative array, and scalar.〔For purposes of this article, the terms (list and array), (associative array, hash, dictionary and mapping) and (string and scalar) are used interchangeably. Such usage is a simplification and may not be correct when specifically applied to some programming languages.〕 Its familiar indented outline and lean appearance make it especially suited for tasks where humans are likely to view or edit data structures, such as configuration files, dumping during debugging, and document headers (e.g. the headers found on most e-mails are very close to YAML). Although well-suited for hierarchical data representation, it also has a compact syntax for relational data.〔A hierarchical model only gives a fixed, monolithic view of the tree structure. For example, either actors under movies, or movies under actors. YAML allows both using a relational model.〕 Its line and whitespace delimiters make it friendly to ''ad hoc'' grep/Python/Perl/Ruby operations. A major part of its accessibility comes from eschewing the use of enclosures such as quotation marks, brackets, braces, and open/close-tags, which can be hard for the human eye to balance in nested hierarchies.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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