a0d929ca_WSRP_v2_0_Specification__Statement_text
[#] CS136 [Section] 9.2.1.1.2 [Statement text] 
The URL MAY specify the wsrp-navigationalState and/or wsrp-navigationalValues portlet URL parameters, whose values the Consumer MUST supply in the opaqueValue and publicValues fields of the NavigationalContext structure, respectively.
WSRP v2.0 Specification
Statement text