<content-language> Content Language
Metadata for a document that identifies the primary language(s) used in the document.
The <content-language> element should appear once for each primary language used in the text of a multi-lingual document. For Best Practice, the content of <content-language> should be the two-letter ISO 639 code for the language, for example, “en” for English, “de” for German, or “es” for Spanish.
- There is no value to using <content-language> on a mono-lingual document.
- The use of a language code value for @xml:lang on a top-level element strongly implies a mono-lingual document.
In conjunction with @xml:lang
For multi-lingual documents, the @xml:lang attribute may be omitted from the top document-level element or the document may use the 3-digit ISO 639-2 value “xml:lang="mul"”, indicating multiple primary languages are used.
This tag set is agnostic on how “primary” is defined, leaving that decision to each producer. However, the intent of this element is to record the principle languages used in a multi-lingual document, not to state that a few quotations in another language occur in an essentially mono-lingual document.