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.
Related reference
XML document type declaration
XML DocTypeDecl
XML NotationDecl
XML entities
XML ElementDef
XML AttributeList
XML AttributeDef
XML DocTypePI
XML WhiteSpace and DocTypeWhiteSpace
XML DocTypeComment
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