August 2005
Intermediate to advanced
175 pages
4h 48m
English
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The DOCTYPE Declaration
A document type declaration contains internal markup declarations or points to external markup declarations that provide a grammar for validating a given document or class of documents.
Productions
[28] doctypedecl ::= '<!DOCTYPE' S Name (S ExternalID)? S? ('[' intSubset ']' S?)? '>'
[28a] DeclSep ::= PEReference | S
[28b] intSubset ::= (markupdecl | DeclSep)*
[29] markupdecl ::= elementdecl | AttlistDecl | EntityDecl | NotationDecl | PI |
CommentExamples
<!DOCTYPE message SYSTEM "myMessage.dtd" > <!DOCTYPE message SYSTEM "http://www.example.com/DTD/myMessage.dtd" > <!DOCTYPE html PUBLIC "-//W3C/DTD XHTML 1.0 Strict//EN" "http://www.w3.org/ TR/xhtml1/DTD/xhtml1-strict.dtd" > <!DOCTYPE message [ <!ELEMENT message (#PCDATA) > <!ATTLIST message date CDATA #REQUIRED > ]> <!DOCTYPE message SYSTEM "myMessage.dtd" [ <!ATTLIST message info CDATA #IMPLIED > ]>
Description
A document type or DOCTYPE
declaration provides information to a validating XML parser about
how to validate an XML document. The DOCTYPE keyword appears first; then the
document, or root, element of the document being validated is
identified, followed by either a SYSTEM or PUBLIC identifier.
SYSTEM indicates that the
DTD will be found as indicated in the filename or URI that follows
(also called a system literal;
for example, "myMessage.dtd" or
"http://www.example.com/DTD/myMessage.dtd“).
PUBLIC hints that the DTD is standard, well known, and widely available—although technically, it just means that a ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.