The language code used when the marked object has no linguistic content.
Should be used when we explicitly know that the data referred has no linguistic content.
See http://www.w3.org/International/questions/qa-no-language#nonlinguistic.
const LANGCODE_NOT_APPLICABLE = 'zxx';
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Language!LanguageInterface.php/constant/LanguageInterface::LANGCODE_NOT_APPLICABLE/8.1.x