xpath namespace problem

I am new to xslt , xpath and tried for-each loop to process each
test.Test block but xpath is not allowing me. I tried
/SOAP:Envelope/SOAP:Body/findResponse/result/test.Test but xpath is
not recognising this default namespace starting from findResponse.

<?xml-stylesheet type="text/xsl" href="test.xsl"?>
<SOAP:Envelope xmlns:SOAP="http://schemas.xmlsoap.org/soap/envelope/">
   <SOAP:Body>
      <findResponse xmlns="xmlapi_1.0">
       <result>
         <test.Test>
           <displayedName>xyz</displayedName>
           <objectFullName>xx:yy</objectFullName>
             ....
          </test.Test>
            ...

I used xsl version 1.0. How to use combination of namespace in xpath
and what is the rule for default name space?

Thanks
Saadat