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→Keys
The key conversion is employed by the [[JSON Module]] and the [[CSV Module]] to encode strings to valid element names and back to the original representation:
* If lax conversion is enabled'''disabled''', invalid characters are replaced with underscores or (when invalid as first character of an element name) prefixed with an underscore. The resulting string may be better readable, but it cannot necessarily be converted back to the original form.* With lax conversion disabled'''enabled''', a string is encoded to a valid NCName representation:
** An empty string is converted to a single underscore ({{Code|_}}).
** Existing underscores are rewritten to two underscores ({{Code|__}}).
