[TYPO3-mvc] RFC: New comments in FLUID

[Jigal van Hemert]

Hi,

On 28-2-2012 15:16, Michael Knoll wrote:
> just wanted to ask, what you think about the following idea on how to
> add comments like <!--- ... ---> in Fluid template engine:

That would make the Fluid template not well-formed in XML [1]:

Comment	::= '<!--' ((Char - '-') | ('-' (Char - '-')))* '-->'

It will also be incorrect in other SGML documents [2] such as (X)HTML:

A comment declaration consists of `<!' followed by zero or more comments 
followed by `>'. Each comment starts with `--' and includes all text up 
to and including the next occurrence of `--'.

So, this special comment will be formed of:
<!   : tag open
--   : comment begin
.... : comment contents
--   : comment end
-    : extra dash
 >    : tag close

Also HTML5 doesn't allow it [3]:

Comments must start with the four character sequence U+003C LESS-THAN 
SIGN, U+0021 EXCLAMATION MARK, U+002D HYPHEN-MINUS, U+002D HYPHEN-MINUS 
(<!--). Following this sequence, the comment may have text, with the 
additional restriction that the text must not start with a single U+003E 
GREATER-THAN SIGN character (>), nor start with a U+002D HYPHEN-MINUS 
character (-) followed by a U+003E GREATER-THAN SIGN (>) character, nor 
contain two consecutive U+002D HYPHEN-MINUS characters (--), nor end 
with a U+002D HYPHEN-MINUS character (-). Finally, the comment must be 
ended by the three character sequence U+002D HYPHEN-MINUS, U+002D 
HYPHEN-MINUS, U+003E GREATER-THAN SIGN (-->).

The special comment has text which ends with a hyphen-minus followed by 
closing '-->'.

[1] http://www.w3.org/TR/REC-xml/#sec-comments
[2] http://www.w3.org/MarkUp/html-spec/html-spec_3.html#SEC3.2.5
[3] http://www.w3.org/TR/html5/syntax.html#comments

-- 
Kind regards / met vriendelijke groet,

Jigal van Hemert.