Has anyone ever seen an Abstract Syntax Notation for CF? Macromedia has
never published one as far as I know. Until there is a formal syntax
notation for CF, comparing it to other languages will always be
unsatisfactory. An interesting puzzle is that a DTD is an abstract
notation for an XML application; so can a DTD be written for CF? If not,
can CF ever be XML? And upon reflection, why should CF be like XML? What is
the benefit?
Joseph
At 12:13 PM 7/29/2005, you wrote:
> Better be careful with custom tags. The following are *not* equivalent:
>
> <cf_myCustomTag>
>
> <cf_myCustomTag/>
>
> The first one gets invoked only once (in start mode); the second gets
> invoked twice (in start and end modes).
That depends on how the tag is coded. If the custom tag contains <cfexit
method="EXITTAG">, then it only gets invoked once. In which case, both calls
are equivalent.
Anyway, as I already noted, "the only exceptions I make are for poorly coded
tags that haven't been properly coded to handle the end tag execution
state." Obviously, I try to avoid using such tags wherever possible.
Ben Rogers
http://www.c4.net
v.508.240.0051
f.508.240.0057
> -----Original Message-----
> From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf
> Of Vince Bonfanti
> Sent: Friday, July 29, 2005 10:08 AM
> To: [email protected]
> Subject: RE: [CFCDev] WOT: CFML as XML
>
> Better be careful with custom tags. The following are *not* equivalent:
>
> <cf_myCustomTag>
>
> <cf_myCustomTag/>
>
> The first one gets invoked only once (in start mode); the second gets
> invoked twice (in start and end modes).
>
> Vince
>
> > -----Original Message-----
> > From: [EMAIL PROTECTED]
> > [mailto:[EMAIL PROTECTED] On Behalf Of Ben Rogers
> > Sent: Thursday, July 28, 2005 8:04 PM
> > To: [email protected]
> > Subject: RE: [CFCDev] WOT: CFML as XML
> >
> > > Especially when reading a cfmodule. (bad, I know. Not my code).
> >
> > I would argue that all custom tag calls, whether they are
> > made with the cfmodule tag, using cfimport or cf_tagName
> > syntax, should either include a closing tag or use the XML
> > style trailing slash. Doing so clears up a lot of ambiguity.
> > The only exceptions I make are for poorly coded tags that
> > haven't been properly coded to handle the end tag execution state.
> >
> > That said, in all other cases, I prefer not to use the XML
> > style trailing slash because it serves no purpose.
> >
> > Ben Rogers
> > http://www.c4.net
> > v.508.240.0051
> > f.508.240.0057
> >
> > > -----Original Message-----
> > > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On
> > > Behalf Of Haikal Saadh
> > > Sent: Thursday, July 28, 2005 6:30 PM
> > > To: [email protected]
> > > Subject: Re: [CFCDev] WOT: CFML as XML
> > >
> > > I favour XML syntax for the same reasons a spike.
> > >
> > > Especially when reading a cfmodule. (bad, I know. Not my
> > code). It's
> > > annoying to have to wonder whether that's it at that stage, or the
> > > cfmodule wraps around other logic.
> > >
> > > It's not goint to take much to make it xml, though:
> > >
> > > Why is cfset not well formed xml?
> > >
> > > <cfset foo="bar" /> is valid, as is
> > > <cfset var foo = "bar" />. var is a valueless attribute. (I
> > forget the
> > > technical term, but they are allowed, like the checked attribute in
> > > certain xhtml form tags)
> > >
> > > cfreturn, then by the above meaning, is also well formed,
> > but it lacks
> > > meaning. Something like <cfreturn value="foo"> would give meaning.
> > >
> > > That leaves cfelse. It could be dropped in favour of something like
> > > JSTL's <choose>. Syntax from memory is something like:
> > > <choose>
> > > <when test="foo">
> > > <!--- Do stuff --->
> > > </when>
> > > <when test="bar">
> > > <!--- Do stuff --->
> > > </when>
> > > <otherwise>
> > > <!--- Do stuff --->
> > > </otherwise>
> > > </choose>
> > >
> > > Barney Boisvert wrote:
> > >
> > > >One point that should be made is that CFML is not XML, no
> > matter how
> > > >it's written. CFELSE, CFSET and CFRETURN are three
> > examples of tags
> > > >that simply cannot be valid XML. If you use a subset of CFML, you
> > > >could make for a valid XML document, but you'd be crippled.
> > > >
> > > >This is one interesting feature of recent versions of JSP. JSP
> > > >documents are valid XML, so you can do some neat things
> > with XSLT and
> > > >such to actually manipulate the code of you app, not just
> > the data it
> > > >manages.
> > > >
> > > >cheers,
> > > >barneyb
> > > >
> > > >On 7/28/05, Spike <[EMAIL PROTECTED]> wrote:
> > > >
> > > >
> > > >>I write code that way because it is required when writing XML and
> > > >>valid XHTML. It's simpler for my poor old brain to remember to
> > > >>always do it that way than to do it one way in most tag based
> > > >>languages and another in ColdFusion.
> > > >>
> > > >>It also makes code more readable for me because it is a more
> > > >>declarative style.
> > > >>
> > > >>If I see this:
> > > >>
> > > >><cfhttp url="blah">
> > > >>
> > > >>There may or may not be a </cfhttp> somewhere further
> > down the page,
> > > >>whereas if I see this:
> > > >>
> > > >><cfhttp url="blah" />
> > > >>
> > > >>I know there isn't one.
> > > >>
> > > >>Spike
> > > >>
> > > >>
> > > >>
> > > >
> > > >
> > > >
> > >
> > >
> > > --
> > > Haikal Saadh, Applications Programmer
> > > Teaching and Learning Support Services
> > >
> > > K405, Queensland University of Technology, Kelvin Grove Campus
> > >
> > > [EMAIL PROTECTED], 3864 8633
> > > CRICOS No. 00213J
> > >
> > >
> > >
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