This example shows an XML DTD in an XML document and the tree structure form of that document:
<!DOCTYPE test PUBLIC "//this/is/a/URI/test" "test.dtd" [ <!NOTATION TeX PUBLIC "//this/is/a/URI/TexID" "//TexID"> <!ENTITY ent1 "this is an entity"> <!ENTITY % ent2 "#PCDATA | subel2"> <!ENTITY % extent1 PUBLIC "//this/is/a/URI/extent1" "more.txt"> <!ENTITY extent2 PUBLIC "//this/is/a/URI/extent2" "more.txt"> <!ENTITY unpsd PUBLIC "//this/is/a/URI/me.gif" "me.gif" NDATA TeX> <?test Do this?> <!--this is a comment--> <!ELEMENT subel2 (#PCDATA)> <!ELEMENT subel1 (subel2 | el4)+> <!ELEMENT el1 (#PCDATA)> <!ELEMENT el2 (#PCDATA | subel2)*> <!ELEMENT el3 (#PCDATA | subel2)*> <!ELEMENT el4 (#PCDATA)> <!ELEMENT el5 (#PCDATA | subel1)*> <!ELEMENT el6 (#PCDATA)> <!ATTLIST subel1 size (big | small) "big" shape (round | square) #REQUIRED> <!ATTLIST el5 el5satt CDATA #IMPLIED> ]>
When a message is parsed by the generic XML parser, the relevant part of the message tree looks like this (assuming that there are no carriage returns or white space between tags):
The IntSubset structure contains the following structures at the next level of nesting: the tree structure for each of these is shown in the tree structures below.
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