The syntax of YAML is similar to that of other high-level languages, and it can simply express data forms such as lists, hashes, scalars, etc. It uses whitespace indentation and a lot of appearance-dependent features, making it particularly suitable for expressing or editing data structures, various configuration files, tilted debug content, and file outlines (for example, many email header formats are very similar to YAML). Although it is more suitable for expressing hierarchical model data structures, there are also refined syntax for representing relational model data. Since YAML uses whitespace characters and line breaks to separate data, it is particularly well-suited for use with grep/Python/Perl/Ruby. Its most hands-on feature is the clever avoidance of various enclosing symbols, such as quotation marks, various parentheses, etc., which can become complex and illegible when nested in structures.
