Is this an error (-in the Sec. D.2.2 XHTMLMOD) ??

In the Second Paragraph of the section D.2.2 [XHTMLMOD], 
there say that MODULE.xmlns.attrib should contain %NS.decl.attrib; plus 
"xmlns %URI.datatype; #FIXED '%MODULE.xmlns;'" when %MODULE.prefixed
is set to 'IGNORE'., 
but in the example, the implementation of it is represented as follow.

<![%Inventory.prefixed;[
<!ENTITY % Inventory.xmlns.attrib
    "%NS.decl.attrib;"
>
]]>
<!ENTITY % Inventory.xmlns.attrib
     "xmlns %URI.datatype;  #FIXED '%Inventory.xmlns;'  <!-- #some error??# -->
>

I think the last line should be ended with quotation mark and 
contain "%NS.decl.attrib".

By the way, I want to know where the parameter entities 
as "NS.decl.attrib", "URI.datatype", and "NS.prefixed" were defined,
and their actual meanings as well as usages.

Best regards,

Jin.