You can control qualifying local element declarations at the schema level.

Add the attribute 'elementFormDefault' to the 'xs:schema' element.

This specifies a semantic default for the 'form' attribute of a local element declaration.

For example, this qualifies all local element declarations:

<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"
   targetNamespace="http://..."
   elementFormDefault="qualified"
>
...
</xs:schema>