a0d929ca_WSRP_v2_0_Specification__Statement_text
[#] CS185 [Section] 4.2 [Statement text] 
When the Consumer does not supply this parameter, the Producer MUST return a portletDescription for each of the "Producer Offered Portlets" the Consumer has access to through the supplied registrationContext.
WSRP v2.0 Specification
Statement text