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On Sat, 04 Dec 2010 23:33:13 +0000, Michael Kay <mike@s...>
wrote:
>> I can't see that allowing -- in comments is important enough to
>> break
>> the tool chain. If it were really that important, I'd suggest
>> dropping
>> comments completely and replacing them with<?comment text ?> but
>> it's
>> probably simpler to just leave them in as is, imperfect though they
>> are.
>>
> Let's break compatibility of both data and tools; just make sure
> there is a clean migration route in both directions for the data,
> which is where the big investment is.
>
> For a comment syntax, what's wrong with
> <xml:comment>....</xml:comment>?
So when you want to comment out a block of XSLT you will type all that
in? Pulleaze :-) Commenting is not just adding comments for
transmission, it is fiddling with the code in progress.
I have recently added an attribute @ignore in my experimental version
of Schematron, to allow commenting out semantically, without removal
from the infoset, plus it states the rationale. It is good for allowing
stubbing out of code and top-down coding.
<assert test="x/y/z" ignore="fix later"> blah blag </assert>
If you are going to "reconstruct" comments, you may need to enumerate
everything they are used for and provide alternatives like @ignore to
every schema: reconstruction is the road that XML Schemas went down with
parameter entities and still missed out bits (conditional sections).
What about this instead: after a < or <! any sequence of unicode
punctuation characters (or symmetrical swap character) is allowed as a
start delimiter, with the close delimiter being the repetition followed
by >, excluding /. This covers <!-- ... --> and <? ... ?> and <![ ...
]> and new ones like <{ }> and <@ ... @>. There would be one kind of
tag for these, with the name being the opening string (!--, ?, ![, {, @,
# whatever}. Systems that are not interested can ignore them. There
would only be one infoset item for them all. You could replace entity
reference syntax with < &> too.
Cheers
Rick Jelliffe
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