if f4m_node is not None and '.f4m' in f4m_node.attrib['src']:
f4m_url = f4m_node.attrib['src']
if 'manifest.f4m?' not in f4m_url:
if f4m_node is not None and '.f4m' in f4m_node.attrib['src']:
f4m_url = f4m_node.attrib['src']
if 'manifest.f4m?' not in f4m_url: