How to declare an attribute on a WSDL service?

Question

WSDL

I need to make a response with an attribute on the WSDL service, but the attribute does not belong to the parent node.
Example:

How can I do this?
This is how it works:

<xsd:element name="testOperationResponse" type="tns:test1"></xsd:element>
<xsd:complexType name="test1"> 
<xsd:sequence>	
       <xsd:element name="name1" type="xsd:string"></xsd:element>
</xsd:sequence>
<xsd:attribute name="atr1" type="xsd:string"></xsd:attribute></xsd:complexType>

But I need even lower.