Error in Instrument DTD (FIX Tag#201) ?

Imported from previous forum

I’m new to FIXML,

The instrument DTD contains the following tag:
Side (Put|Call) #REQUIRED
SideFIXTag CDATA #FIXED "201"
Where according to the FIX spec tag 201 is PutOrCall. And in accordance with the spec the base.dtd contains:
Side FIXTag CDATA #FIXED "54"

Is this correct ? If so, why?