有消息:
<Employees xmlns="https://services">
<Employee>
<SNILS>111-111-111-2</SNILS>
<Name>Elena</Name>
</Employee>
</Employees>
输出应如下所示:
<Employees xmlns:i="http://www.w3.org/2001/XMLSchema-instance" xmlns="https://services">
<Employee>
<SNILS>111-111-111-2</SNILS>
<Name>Elena</Name>
<Sex i:nil="true"/>
</Employee>
</Employees>
如何得到这样的结果?