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