SOAP request with complex parameters

[#1]

There is SOAP-service with the following function:

&lt?xml version="1.0" encoding="utf-8"?>

&ltsoap12:Envelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:soap12="http://www.w3.org/2003/05/soap-envelope">

 &ltsoap12:Body>

  &ltTestSecod xmlns="http://10.0.0.254:8088/InvoiceAndPaymentsRegisterService/InternalIandPRegisterService.asmx">

   &ltobTest>

    &ltTextData>string&lt/TextData>

    &ltIntData>int&lt/IntData>

    &ltDateData>dateTime&lt/DateData>

   &lt/obTest>

  &lt/TestSecod>

 &lt/soap12:Body>

&lt/soap12:Envelope>

The WSDLC.exe-compiler (ASA12) generates the following code:

alter function "InternalIandPRegisterService.TestSecod"( / "obTest" _254._0._0._10.InvoiceAndPaymentsRegisterService.InternalIandPRegisterService_asmx.ObjToTest /)
 returns xml
 url 'http://10.0.0.254:8088/InvoiceAndPaymentsRegisterService/InternalIandPRegisterService.asmx'
 type 'SOAP:DOC'
 set 'SOAP(OP=TestSecod)'
 namespace 'http://10.0.0.254:8088/InvoiceAndPaymentsRegisterService/InternalIandPRegisterService.asmx';

Q1: Is it right to change the commented parameter as follows:

alter function "InternalIandPRegisterService.TestSecod"( "obTest" xml)

?
Q2: What should be a request not to receive 400 and 500 error codes? For example: if

SELECT "InternalIandPRegisterService.TestSecod"('&ltobTest>&ltTextData>my string&lt/TextData>&ltIntData>314&lt/IntData>&ltDateData>2014-07-24&lt/DateData>&lt/obTest>');

then

HTTP request failed. Status code '500 Internal Server Error'
SQLCODE=-983, ODBC 3 State="HY000"

P.S. As a 'Left angle brackets', I used &lt. Preview - OK, but now is visible only only &lt :=(