Read an XML document provided as a byte string, and return a
    :mod:`lxml.etree` document. String cannot be a Unicode string.
    Base_uri should be provided for the calculation of relative URIs.

def parseString(string, uri=None):
    """Read an XML document provided as a byte string, and return a
    :mod:`lxml.etree` document. String cannot be a Unicode string.
    Base_uri should be provided for the calculation of relative URIs."""
    return etree.fromstring(string, parser=_get_xmlparser(), base_url=uri)