<?xml version="1.0"?>
<!DOCTYPE root [
<!ELEMENT root ANY>
<!ATTLIST root attr1 CDATA #IMPLIED>
<!ATTLIST root attr2 CDATA #IMPLIED>
<!NOTATION JPGformat SYSTEM "JPGFormat">
<!ENTITY aImage SYSTEM "image.jpg" NDATA JPGformat>
]>
<root attr1="&aImage;">direct reference to external unparsed entinity in Attribute</root>