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[[tags:eggs]]

== doctype

Provides HTML and XHTML doctypes as strings.

[[toc:]]

=== Interface

<constant>doctype-html</constant>

Generic HTML doctype.  Introduced in the HTML5 spec, but is
backwards-compatible with older browsers, which use it only
to switch into standards mode.

<!DOCTYPE HTML>

<constant>doctype-xhtml-1.0-strict</constant> 
<constant>doctype-html-4.01-strict</constant> 
<constant>doctype-xhtml-1.0-transitional</constant> 
<constant>doctype-html-4.01-transitional</constant> 
<constant>doctype-xhtml-1.0-frameset</constant> 
<constant>doctype-html-4.01-frameset</constant> 
<constant>doctype-html-3.2</constant> 
<constant>doctype-html-2.0</constant>

Strings corresponding to the "obsolete permitted" HTML and XHTML
doctypes.  In general it is safe to use {{doctype-html}} instead, as the
doctype is typically only used to switch browsers into standards mode,
and all known browsers do this with {{doctype-html}}.

;doctype-html-4.01-strict
 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">

<constant>doctype-html-legacy</constant>

Legacy HTML doctype, which should only be emitted by a renderer when
it cannot produce the shorter {{doctype-html}}.  Don't use this.

<!DOCTYPE HTML SYSTEM "about:legacy-compat">

<constant>xhtml-1.0-strict</constant> 
<constant>html-4.01-strict</constant> 
<constant>xhtml-1.0-transitional</constant> 
<constant>html-4.01-transitional</constant> 
<constant>xhtml-1.0-frameset</constant> 
<constant>html-4.01-frameset</constant> 
<constant>html-3.2</constant> 
<constant>html-2.0</constant>

Aliases for {{doctype-*}}.  Deprecated as of {{doctype}} version 2.0.

<constant>doctype-rules</constant>

A handy ruleset for use with [[sxml-transforms]].  Rules are named like
the corresponding constants -- for example, {{doctype-html}} -- and will
output the HTML doctype as a string.

This ruleset contains preorder rules which should be appended/prepended
to the {{universal-conversion-rules}} because they output raw text which
should not be processed again.  See the example below.

Note: for compatibility with ''doctype'' egg versions 2.0 and earlier,
rules without the {{doctype-}} prefix are accepted as well:
e.g. {{xhtml-1.0-strict}}. The only exception is {{html}}, which
conflicts with the {{<html>}} tag.

=== Examples

#;1> (import doctype)
 #;2> (print doctype-html)
 <!DOCTYPE HTML>
 #;3> (print doctype-xhtml-1.0-strict)
 <!DOCTYPE HTML PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
 "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
 #;4> (import sxml-transforms)
 #;5> (SRV:send-reply
 (pre-post-order
 `((doctype-xhtml-1.0-strict)
 (html (body "blah")))
 (append doctype-rules universal-conversion-rules)))
 <!DOCTYPE HTML PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
 "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
 <html>
 <body>blah</body></html>

=== About this egg

==== Source

[[https://github.com/ursetto/doctype-egg]]

==== Author

[[http://3e8.org|Jim Ursetto]]

==== Version history

; 2.2 : Add Chicken 5 support
; 2.1 : Add {{doctype-}} prefixes to doctype-rules; fix bug in html-2.0 rule
; 2.0 : Add {{doctype-}} prefixes, deprecate old aliases, add {{doctype-html}}
; 1.2 : Add {{doctype-rules}}
; 1.1 : Fix typo in html-4.01-transitional
; 1.0 : Initial release

==== License

Public domain.

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