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Re: xforms 1.1 xf:insert examples

From: Erik Bruchez <ebruchez@orbeon.com>
Date: Mon, 24 Jul 2006 16:18:14 +0200
Message-ID: <44C4D6A6.5050404@orbeon.com>
To: www-forms@w3.org

Aaron Reed wrote:
> 
> Hi,
> 
> As a suggestion for the XForms 1.1 spec, for the section on the insert 
> action, I'd suggest a few more 'after' examples.  We can see the 
> 'before' instance data, but we don't see the 'after' instance data after 
> the action has occurred.
> 
> Also, it is not immediately apparent to me after reading this section 
> and the examples what the context node is for evaluating @nodeset.  It 
> should be the context node of the insert action UNLESS @context is there 
> and then it is relevant to that node?  Do I have that right?  And the 
> context node for @context, is the context node for the insert action?

Yes, I think this has been clarified a little in the latest internal 
drafts. The idea is that @context evaluates as you expect, i.e. in the 
context of the action element, and then @context actually _replaces_ the 
context for that action element, which means that @nodeset and @origin 
evaluate now within the context created by @context.

There is a thought of extending the use of @context to all action 
elements, but this probably won't make it into 1.1, so for now @context 
is usable only on xforms:insert and xforms:delete.

> 
> so for:
> 
> <xf:model id="mymodel">
>   <xf:instance id="instance0" xmlns="">
>     ...
>   </xf:instance>
>   <xf:instance id="instance1" xmlns="">
>     <instanceData>
>       <muppets>
>         <muppet>
>           <name>Kermit the Frog</name>
>           <description>stage manager</description>
>           <description>frog</description>
>         </muppet>
>         <muppet>
>           <name>Swedish Chef</name>
>           <description>Swedish</description>
>           <description>chef</description>
>           <description>wears a hat</description>
>         </muppet>
>         <muppet>
>           <name>Animal</name>
>         </muppet>
>       </muppets>
>     </instanceData>
>   </xf:instance>
>   <xf:instance id="template">
>     <templates>
>       <description>main character</description>
>       <description>secondary chardescription>
>     </templates>
>   </xf:instance>
> </xf:model>
> 
> ....
> 
> <xf:group ref="instance('instance1')/instanceData">
>   <xf:trigger ref="muppets/muppet">
>     <xf:label>trigger label</xf:label>
>     <xf:insert context="../muppet[2]" nodeset="description[3]" 
> origin="instance('template')/description[2]" position="before"/>
>   </xf:trigger>
> </xf:group>
> 
> Would activating this trigger leave us with this?
> 
>   <xf:instance id="instance1" xmlns="">
>     <instanceData>
>       <muppets>
>         <muppet>
>           <name>Kermit the Frog</name>
>           <description>stage manager</description>
>           <description>frog</description>
>         </muppet>
>         <muppet>
>           <name>Swedish Chef</name>
>           <description>Swedish</description>
>           <description>chef</description>
> ***       <description>secondary character</description> ***
>           <description>wears a hat</description>
>         </muppet>
>         <muppet>
>           <name>Animal</name>
>         </muppet>
>       </muppets>
>     </instanceData>
>   </xf:instance>
> 
> If I my understanding about evaluation contexts is wrong above, then 
> what would happen?

Note that you have two errors in your code above. Replace:

   <xf:group ref="instance('instance1')/instanceData">

with:

   <xf:group ref="instance('instance1')">

You are also missing an ev:event attribute on your action:

   <xforms:insert ev:event="DOMActivate" ...

With these changes, you result will be exactly as you say, and it works 
exactly like that in Orbeon PresentationServer.

-Erik

-- 
Orbeon - XForms Everywhere:
http://www.orbeon.com/blog/
Received on Monday, 24 July 2006 14:18:25 GMT

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