The user options are stored inside the ::com::sun::star::document::MediaDescriptor
and can be queried from the ::com::sun::star::document::MediaDescriptor by
the component that implements ::com::sun::star::document::XFilter.
The application will set the ::com::sun::star::document::MediaDescriptor
using the interface ::com::sun::star::beans::XPropertyAccess and then
call XExecutableDialog::execute.
If that method returns ExecutableDialogResults::OK
,
the application will retrieve the changed ::com::sun::star::document::MediaDescriptor
back using the interface ::com::sun::star::beans::XPropertyAccess. The filter
operation is than continued, using the new ::com::sun::star::document::MediaDescriptor.
Otherwise, the filter operation is canceled.