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%xinclude.xmlns.attrib; XInclude Namespace Pseudo-attribute

Puts together all the parts of the XInclude namespace pseudo-attribute: the prefix and the URI value.
Declaration
<!ENTITY % xinclude.xmlns.attrib
     "xmlns:%xinclude.prefix;
                        CDATA             #FIXED '%xinclude.xmlns;'" >
Expanded Declaration

xmlns:xi CDATA #FIXED 'http://www.w3.org/2001/XInclude'