a0d929ca_WSRP_v2_0_Specification__Statement_text
[#] CS033 [Section] 4.2 [Statement text] 
The minimum information a Producer MUST return from getServiceDescription is that which declares what is required for a Consumer to register (i.e. the requiresRegistration flag and whenever additional data is required, the registrationPropertyDescription field) with the Producer.
WSRP v2.0 Specification
Statement text