def IdentifiersIndexer(instance):
    """Return a list of unique Identifier strings
    This populates the Identifiers Keyword index, but with some
    replacements to prevent the word-splitter etc from taking effect.
    """
    identifiers = instance.Schema()['Identifiers'].get(instance)
    return [safe_unicode(i['Identifier']) for i in identifiers]
Return a list of unique Identifier strings
    This populates the Identifiers Keyword index, but with some
    replacements to prevent the word-splitter etc from taking effect.