P T Withington wrote:
> Whether the canvas tag should accept namespace and
schema declarations
> is open to discussion. Our current philosophy is that
LZX is all in a
> single (implicit) namespace.
Well, yes you are quite right to point out that LZX markup
is in a
single namespace but if you are going to publish an XML
schema then the
only way to reference the schema is by using the
xsi:schemaLocation
attribute and it's attendant namespace declaration. If
people are going
to use the schema during editing then the compiler must
support the
presence of the afore mentioned attributes, otherwise it
will be a right
royal pain in the behind if you have to remove those
attributes before
you can render the document.
As a matter of interest, what does the compiler use to
validate an LZX
canvas document?
I'd imagine that it cannot be either the DTD or the XML
schema seeing as
the schema is broken and the DTD does not support foreign
mark-up in a
dataset element.
Now I have just noticed that in the DTD/XML Schema that
there are two
interesting attributes on the dataset element:
namespace
nsprefix
Do they have any baring on this subject?
Regards
Philip Fennell
-----Original Message-----
From: P T Withington [mailto:ptw openlaszlo.org]
Sent: 12 April 2007 16:20
To: Fennell, Philip
Cc: laszlo-useropenlaszlo.org
Subject: Re: [Laszlo-user] More on namespaces and XML
schema...
Thanks for this report. I have added your message to
[LPP-3179]
(http:
//jira.openlaszlo.org/jira/browse/LPP-3179) as being
relevant to
that bug. We know that the dtd is not accurate and that the
namespace
is stale. We hope to address these issues soon.
There are possibly separate issues that should be reported
(the bad doc
link). Whether the canvas tag should accept namespace and
schema
declarations is open to discussion. Our current philosophy
is that LZX
is all in a single (implicit) namespace.
On 2007-04-12, at 09:36 EDT, Fennell, Philip wrote:
> Hello again,
>
> Seeing as the link in the documentation (running under
tomcat) for
> lzx.dtd returns a 404 error I had to do a bit of
searching around on
> the net. There's a link on the wiki, under 'Editing
LZX' that is also
> broken too.
>
> So initialy I tried using the XML Schema (lzx.xsd) and
noticed
> immediately:
>
> 1) That the form and window elements are not defined in
the schema.
>
>
> 2) There are errors in the schema too:
>
> In the definition of the element 'preloadresource' the
name and
> resource attributes are also declared elsewhere in
attributeGroup
> declarations referenced directly and indirectly by this
element
> declaration.
>
>
> 3) If you put the appropriate markup, in the root of
you canvas
> document, to identify the schema:
>
> <canvas xmlns="http:/
/www.laszlosystems.com/2003/05/lzx"
> xmlns si=&q
uot;http:
//www.w3.org/2001/XMLSchema-instance"
> xsi:schemaLocation="http://www.l
aszlosystems.com/2003/05/lzx
> ../schema/lzx.xsd"
> width="1024"
> height="768">
> ...
> </canvas>
>
> You get the following error message form the compiler:
>
>
> The application could not be compiled due to the
following errors:
>
> Compilation Errors
> form.lzx:10:22: Syntax error: the token ":"
was not expected at this
> position.
> Compilation Warnings
>
> form.lzx:10:22: attribute "schemaLocation"
from namespace
> "http:
//www.w3.org/2001/XMLSchema-instance" not allowed
at this point;
> ignored
> form.lzx:10:22: found an unknown attribute named
"schemaLocation" on
> element canvas, check the spelling of this attribute
name
>
>
> This would suggest that not only is Open Laszlo not XML
namespace
> aware (see previous e-mail) but neither is it XML
Schema aware either.
>
>
> Its not that I'm being picky for picky's sake, I
actually like what
> I've seen of Open Laszlo so far. Its just that things
I'd want and
> expect to work don't.
>
>
> Regards
>
> Philip Fennell
>
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