Query from ReportBuilder 3.0

Dec 9, 2014 at 2:43 PM
Hello, I got a web service such a structure:
<NewDataSet>
<MyField>
 <EmpInfo>
    <FirstName>a</FirstName> 
   <LastName>b</LastName> 
   <Adress>c</Adress> 
</EmpInfo>
<EducationInfo>
       <YearofPassing>2001</YearofPassing> 
       <Skill>1</Skill> 
  </EducationInfo>
</MyField>
</NewDataSet>

but do not know how to make a request from the report builder. This query returns an empty result

<Query>
<ElementPath>
NewDataSet{}/MyField{}/EmpInfo
</ElementPath>
</Query>

Help please!