Currently have this in the DTD.

<!ENTITY image SYSTEM "st_kilda.jpg" NDATA Jpeg>
<!NOTATION Jpeg SYSTEM "image/jpg">
<!ELEMENT image EMPTY>
<!ATTLIST image
width CDATA #REQUIRED
height CDATA #REQUIRED
icon ENTITY #REQUIRED>

Then this in the XML.

<image width="420" height="420" icon="picture"/>


Getting this error: ENTITY "picture" is not unparsed