The setPropertyDefaultLanguage element cannot have "xsi:nil" as an attribute.
The setPropertyDefaultLanguage element in XML instance can be substituted with other elements.
XML Instance
An operation which sets the RFC3066 language code that will be the
default language for new properties created via DIWS PDR auto-creation
<documentation>
An operation which sets the RFC3066 language code that will be the
default language for new properties created via DIWS PDR auto-creation
</documentation>