a0d929ca_WSRP_v2_0_Specification__Statement_text
[#] CS058 [Section] 5.1.16 [Statement text] 
If the field's (useCachedMarkup) value is "true", any supplied cacheControl field MUST be processed as an update to the cacheControl originally supplied with the cached markup.
WSRP v2.0 Specification
Statement text