Adds meta information to a class definition.
    @param name: name of the meta data class
    @type name: str or unicode
    @param value: metadata value
    @type value: str or unicode
    @param scheme: format information about the value
    @type scheme: str or unicode or None

def meta(name, value, scheme=None):
    """
    Adds meta information to a class definition.
    @param name: name of the meta data class
    @type name: str or unicode
    @param value: metadata value
    @type value: str or unicode
    @param scheme: format information about the value
    @type scheme: str or unicode or None
    """
    annotate.injectClassCallback("meta", 3, "annotate_meta",
                                 name, value, scheme=scheme)