getPortletProperties(), desired locale

for operations that return localized data, the pattern is to send desired locales as a possible limiter, indicating what locales the consumer is interested in.

the getPortletProperties() operation returns a list of localized property values. said operation is not passed the desired locales. in the case when there is a jsr-168 portlet behind the wsrp portlet, it is possible for the jsr-168 portlet to have multiple localized preference values for a given preference name (see PLT.14.3.1 in the 1.0 portlet spec).

is getPortletProperties() expected to return multiple localized values for a given property name? 

if so, why does this operation not accept desired locales?

if not, how does the producer choose which localized values to send back?

thanks.