def get_xml(self):
        if not (self.CNPJ.valor):
            return ''
        xml = XMLNFe.get_xml(self)
        xml += u'<ferroEnv>'
        xml += self.CNPJ.xml            
        xml += self.cInt.xml            
        xml += self.IE.xml            
        xml += self.xNome.xml
        xml += self.enderFerro.xml
        xml += '</ferroEnv>'
        return xml