[Laszlo-dev] <datapath> isn't allowed on the canvas

[Philip Romanik]

Detecting and displaying an error message isn't hard. However, there 
are a lot of downstream errors. What is the best way to stop the 
application from running?

Thanks!

Phil


>Hmm, in lps 3.4, the schema says it's permitted, but it also crashes there.
>I think we ought to fix it so it doesn't crash at least.
>
>The schema currently allows this because datapath is a subclass of 
>datapointer, and datapointer is allowed at the top level of canvas.
>
><interface name="canvas" extends="Instance">
>   <containsElements>
>     <element>view</element>
>     <element>script</element>
>     <element>stylesheet</element>
>     <element>audio</element>
>     <element>resource</element>
>     <element>font</element>
>     <element>datasource</element>
>     <element>datapointer</element>
>     <element>dataset</element>
>....
>
>
>The schema description language I wrote (an extension of the 
><interface> declaration syntax) currently doesn't have any way to 
>say that a child class is allowed (e.g., datapointer), but one of 
>its subclasses
>(datapointer) is forbidden.
>
>
>
>
>
>On 11/6/07, Philip Romanik 
><<mailto:promanik at laszlosystems.com>promanik at laszlosystems.com> wrote:
> >
> >  Somebody with more knowledge about data handling should make this
> > call. I think it's an error because it will crash swf if defined 
> at top-level.
> >
> >
> >
> >
> > Would you like it to generate  a warning, or compiler error?
> >
> >  On 11/6/07, Philip Romanik < 
> <mailto:promanik at laszlosystems.com>promanik at laszlosystems.com> wrote:
> >  > Hi Henry,
> >  >
> >  > This bug,
> > 
> <http://jira.openlaszlo.org/jira/browse/LPP-3767>http://jira.openlaszlo.org/jira/browse/LPP-3767, 
> is  > generated
> > because a user can create a <datapath> tag on the canvas.
> >  > Is it possible to fix this in the schema?
> >  > A datapath isn't allowed on the canvas. The test case come 
> from LPP-2089:
> >  >
> >  >
> >  > <canvas>
> >  >      <dataset name="test">
> >  >          <item>first</item>
> >  >          <item>second</item>
> >  >      </dataset>
> >  >
> >  >      <datapath id="dp" xpath="test:/item"/>
> >  >      <handler name="oninit">
> >  >         Debug.write(dp);
> >  >      </handler>
> >  > </canvas>
> >  >
> >  >
> >  > This crashes swf, and generates errors in dhtml. If this can't be
> > > handled by the schema, I'll handle it in the LFC.
> >  >
> >  > Thanks!
> >  >
> >  > Phil
> >  >
> >  >
> >
> >
> >  --
> >  Henry Minsky
> >  Software Architect
> >  <mailto:hminsky at laszlosystems.com>hminsky at laszlosystems.com
>
>
>--
>Henry Minsky
>Software Architect
><mailto:hminsky at laszlosystems.com>hminsky at laszlosystems.com
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