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| '''Summary'''
|Encodes the specified {{Code|$key}} (with the optional {{Code|$lax}} conversion method) to a valid NCName representation, which can be used to create an element node:* An empty string is converted to a single underscore ({{Code|_}}).* Existing underscores are rewritten to two underscores ({{Code|__}}).* Characters that are no valid NCName characters are rewritten to an underscore and the character’s four-digit Unicode. For example, the exclamation mark {{Code|?}} is transformed to {{Code|_003f}}.* If lax conversion is chosen, invalid characters are replaced with underscores or (when invalid as first character of an element name) prefixed with an underscore.<br />The resulting string may be better readable, but it cannot necessarily be converted back to the original form.This encoding is used by the same that is used {{Code|direct}} conversion format in the [[JSON Module]] and the [[CSV Module]] and the {{Code|direct}} conversion format.
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| '''Examples'''
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* <code>element { convert:encode-key("!") } { 'text' }</code> creates a new element with an encoded name key: <code><_0021/></code>.
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| '''Summary'''
|Decodes the specified {{Code|$key}} (with the optional {{Code|$lax}} conversion method) to the original string representation.<br />Keys supplied to this function are usually element names from documents that have been created with the [[JSON Module]] and the [[CSV Module]] and the {{Code|direct}} conversion format.
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| '''Examples'''
