DTD DOCTYPE

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Using the DOCTYPE node it is possible to specify a set of DTD Schema rules that are defined inline within the XML Document

The square brackets [...] contain the DTD Schema rules.

InlineSchema.xml	Copy Code
<?xml version="1.0"?> <!DOCTYPE note [ <!ELEMENT note (to,from,heading,body)> <!ELEMENT to (#PCDATA)> <!ELEMENT from (#PCDATA)> <!ELEMENT heading (#PCDATA)> <!ELEMENT body (#PCDATA)> ]> <note> <to>Tove</to> <from>Jani</from> <heading>Reminder</heading> <body>Don't forget me this weekend</body> </note>

InlineSchema.xml

Copy Code

<?xml version="1.0"?>
<!DOCTYPE note [
    <!ELEMENT note (to,from,heading,body)>
    <!ELEMENT to (#PCDATA)>
    <!ELEMENT from (#PCDATA)>
    <!ELEMENT heading (#PCDATA)>
    <!ELEMENT body (#PCDATA)>
]>
<note>
    <to>Tove</to>
    <from>Jani</from>
    <heading>Reminder</heading>
    <body>Don't forget me this weekend</body>
</note>

EBNF Syntax

The syntax for an XML DOCTYPE described by the W3C as using EBNF as follows.

[28]  doctypedecl       ::= '<!DOCTYPE' S Name (S ExternalID)? S? ('[' intSubset ']' S?)? '>'