```xml
<wfs:Query typeNames="myns:Person myns:Person" aliases="a b">
<fes:Filter>
<fes:And>
<fes:PropertyIsEqualTo>
<fes:ValueReference>a/Identifier</fes:ValueReference>
<fes:Literal>12345</fes:Literal>
</fes:PropertyIsEqualTo>
<fes:PropertyIsEqualTo>
<fes:ValueReference>a/spouse<fes:ValueReference>
<fes:ValueReference>b/Identifier</fes:ValueReference>
</fes:PropertyIsEqualTo>
</fes:And>
</fes:Filter>
</wfs:Query>
```