如何从带有命名空间但在Java中没有前缀的XML中获取值？

well, this is the xml:

好吧,这是xml:

<?xml version="1.0" encoding="utf-8"?>
<soap:Envelope xmlns:soap="https://schemas.xmlsoap.org/soap/envelope/" xmlns:xsi="https://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="https://www.w3.org/2001/XMLSchema">
<soap:Body>
<FECompUltimoAutorizadoResponse xmlns="https://ar.gov.afip.dif.FEV1/">
<FECompUltimoAutorizadoResult>
<PtoVta>12</PtoVta>
<CbteTipo>1</CbteTipo>
<CbteNro>1</CbteNro>
</FECompUltimoAutorizadoResult>
</FECompUltimoAutorizadoResponse>
</soap:Body>
</soap:Envelope>
<?xml vers