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Request for enhancement: allow single-node binding attributes on `xf:action`

From: Clark, John <CLARKJ2@ccf.org>
Date: Mon, 22 Jan 2007 13:46:56 -0500
Message-ID: <F122C25B4CD6F34BB119A97593679601027CA7EC@CCHSCLEXMB59.cc.ad.cchs.net>
To: www-forms@w3.org, www-forms-editor@w3.org

I would like to request that the content model of `xf:action`[0] be
augmented to include a context attribute that would have the same
behavior as the context attribute on `xf:insert` and `xf:delete`.  This
would allow XForms authors to specify the XPath context for components
(i.e. descendants) of such actions.

For example, an author might want to specify an action, that is bound to
a model, with several components that each use a common XPath context.
This might look like the following (assuming the `xf` prefix is
correctly bound to the XForms namespace):

  <xf:model id="m">
  <!-- ... -->
    <xf:action ev:event="someEvent"
context="some/context/location[condition]">
      <xf:delete nodeset="@data"/>
      <xf:setvalue ref="@missing">yes</xf:setvalue>
    </xf:action>
  </xf:model>

According to the current spec, however, both the above `xf:delete` and
the `xf:setvalue` would need to provide the entire XPath context, which
could require redundant computation of potentially elaborate XPath
statements and would be more bug-prone and difficult to read.  Note that
the example in the specification for the `xf:delete`[2] action has a
similar redundancy.

[0] http://www.w3.org/TR/2006/WD-xforms11-20061212/#action-action

[1]
http://www.w3.org/TR/2006/WD-xforms11-20061212/#structure-attrs-single-n
ode

[2] http://www.w3.org/TR/2006/WD-xforms11-20061212/#action-delete

Take care,

    John L. Clark  |  Systems Analyst
                   |  Cardio-Thoracic Surgery Research
 Cleveland Clinic  |  9500 Euclid Ave.   |  Cleveland, OH 44195
                   |  (216) 445-6011

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Received on Monday, 22 January 2007 18:47:22 GMT

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