I am implementing a soap client in java utilizing jaxb and spring webservices so I don't have to build out the various stub files for the wsdl. I have been successful with login() and getServerTimestamp(). I am now looking at the upsert(). The request body for the upsert() is as follows (retrieved this using soapUI). I understand the sessionHeader and the resetting of the service endpoint after login, however I am not clear on how to insert the sObjects based on this request outline. Currently I would only be using the wsdl to upsert personAccounts. Could someone provide me an example of a raw xml request that would upsert personAccounts or any sObject?

<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:urn="urn:enterprise.soap.sforce.com" xmlns:urn1="urn:sobject.enterprise.soap.sforce.com">
   <soapenv:Header>
      <urn:EmailHeader>
         <urn:triggerAutoResponseEmail>?</urn:triggerAutoResponseEmail>
         <urn:triggerOtherEmail>?</urn:triggerOtherEmail>
         <urn:triggerUserEmail>?</urn:triggerUserEmail>
      </urn:EmailHeader>
      <urn:PackageVersionHeader>
         <!--Zero or more repetitions:-->
         <urn:packageVersions>
            <urn:majorNumber>?</urn:majorNumber>
            <urn:minorNumber>?</urn:minorNumber>
            <urn:namespace>?</urn:namespace>
         </urn:packageVersions>
      </urn:PackageVersionHeader>
      <urn:DebuggingHeader>
         <urn:debugLevel>?</urn:debugLevel>
      </urn:DebuggingHeader>
      <urn:AllOrNoneHeader>
         <urn:allOrNone>?</urn:allOrNone>
      </urn:AllOrNoneHeader>
      <urn:DisableFeedTrackingHeader>
         <urn:disableFeedTracking>?</urn:disableFeedTracking>
      </urn:DisableFeedTrackingHeader>
      <urn:AllowFieldTruncationHeader>
         <urn:allowFieldTruncation>?</urn:allowFieldTruncation>
      </urn:AllowFieldTruncationHeader>
      <urn:MruHeader>
         <urn:updateMru>?</urn:updateMru>
      </urn:MruHeader>
      <urn:AssignmentRuleHeader>
         <urn:assignmentRuleId>?</urn:assignmentRuleId>
         <urn:useDefaultRule>?</urn:useDefaultRule>
      </urn:AssignmentRuleHeader>
      <urn:SessionHeader>
         <urn:sessionId>?</urn:sessionId>
      </urn:SessionHeader>
   </soapenv:Header>
   <soapenv:Body>
      <urn:upsert>
         <urn:externalIDFieldName>?</urn:externalIDFieldName>
         <!--Zero or more repetitions:-->
         <urn:sObjects>
            <!--Zero or more repetitions:-->
            <urn1:fieldsToNull>?</urn1:fieldsToNull>
            <urn1:Id>?</urn1:Id>
         </urn:sObjects>
      </urn:upsert>
   </soapenv:Body>
</soapenv:Envelope>

 I am considering using the generated enterprise wsdl for ETL operations from an external system into SFDC. I have a few questions concerning the wsdl:

1) There doesn't seem to be any authentication in the wsdl. Is this the case or did I miss something?

2) Are there any governor limits on wsdl use?