How ebrary determines the “document language” setting for a book

In most cases ebrary gets the “document language” setting for each book from the Publisher metadata.  The Publisher assigns one or more language codes in accordance with the language(s) of significant portions of the text.

If there is no language code provided by the Publisher, then ebrary gets the language code(s) from Bowker.  If there are no language codes assigned by the Publisher or Bowker, then ebrary metadata staff assign the code(s) based on the language(s) of the title.