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XBRL supports multilingual taxonomies by allowing labels to be defined in multiple languages. When labels in multiple languages are defined, the software used to display an XBRL report or taxonomy can allow the reader to view labels in their preferred language. This guidance is for taxonomy architects and taxonomy authors and covers how to use multilingual labels within a taxonomy. It is important to note that the language of a taxonomy label does not define or enforce the language of a fact in an XBRL report.
2.1 Identifying the label language
The language for a label is identified using a tag 1, for example 'en-US' is used to identify "US English". Although more complicated formats are technically permitted, common practice is to use either a one part language code (e.g. "en") or a two part language-region code (e.g. "en-US"), and it is recommended that taxonomies use one of these two options.
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