a0d929ca_WSRP_v2_0_Specification__Statement_text
[#] CS176 [Section] 9.2.1 [Statement text] 
Consumers MUST accept both the "&" character and the corresponding entity reference (i.e. "&") as separators between the name/value pairs as this allows portlets to produce markup fragments valid for a larger range of mime types.
WSRP v2.0 Specification
Statement text