SOAP defines two namespaces:
The SOAP envelope, the root element of a SOAP message, has the following namespace identifier:
"http://schemas.xmlsoap.org/soap/envelope"
The SOAP serialization, the URI defining SOAP’s serialization rules, has the following namespace identifier:
"http://schemas.xmlsoap.org/soap/encoding"
When you use SAAJ to construct or consume messages, you are responsible for setting or processing namespaces correctly and for discarding messages that have incorrect namespaces.