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Re: [Moderator Action] [long] nested repeats and index()

From: Thierry Michel <tmichel@w3.org>
Date: Tue, 3 Sep 2002 17:58:44 +0200
Message-ID: <134a01c25362$c8295e90$228a608a@inria.fr>
To: Jérôme Nègre <jerome.negre@e-xmlmedia.fr>, <www-forms-editor@w3.org>

Moderator: sent to www-forms-editor@w3.org

----- Original Message -----
From: "Jérôme Nègre" <jerome.negre@e-xmlmedia.fr>
To: <www-forms-editor@w3.org>
Sent: Tuesday, August 27, 2002 2:39 PM
Subject: [Moderator Action] [long] nested repeats and index()


>
>
>
> Hi,
>
> I think that the behaviour of index() and nested repeats isn't well
> defined in the latest draft.
>
> Take the following <instance>:
>
> <bookmarks>
> <section>
> <bookmark name="Main page"/>
> <bookmark name="ecma"/>
> </section>
> <section>
> <bookmark name="images"/>
> </section>
> </bookmarks>
>
> And the following UI:
>
> <repeat nodeset="section" id="repeatSections">
> <repeat nodeset="bookmark" id="repeatBookmarks">
> <output ref="@name"/>
> </repeat>
> </repeat>
> <...>
> <trigger id="insertbutton">
> <label>Insert bookmark</label>
> <insert nodeset="section[index('repeatSections')]/bookmark"
> at="index('repeatBookmarks')" position="after" event="xforms-activate"/>
> </trigger>
> <trigger id="insertsectionbutton">
> <label>Insert section</label>
> <insert nodeset="section" at="index('repeatSections')" position="after"
> event="xforms-activate"/>
> </trigger>
>
> Those are taken (and adapted) from the example in chapter G.2.
>
>
> Step 1/
> ------
> At startup, all index values are 1: index('repeatSections') returns 1,
> index('repeatBookmarks') returns 1.
>
> Step 2/
> ------
> The user triggers 'Insert bookmark', the instance now look like this:
> <bookmarks>
> <section>
> <bookmark name="Main page"/>
> <bookmark name="images"/>
> <bookmark name="ecma"/>
> </section>
> <section>
> <bookmark name="images"/>
> </section>
> </bookmarks>
>
> index('repeatSections') still returns 1, index('repeatBookmarks') now
> returns 2 (chapter 9.3.5, point 3).
>
> Step 3/
> ------
> The user triggers 'Insert section', the instance now look like this:
> <bookmarks>
> <section>
> <bookmark name="Main page"/>
> <bookmark name="images"/>
> <bookmark name="ecma"/>
> </section>
> <section>
> <bookmark name="images"/>
> </section>
> <section>
> <bookmark name="images"/>
> </section>
> </bookmarks>
>
> index('repeatSections') now returns 2, index('repeatBookmarks') still
> returns 2.
>
> However, the Xpath expression
> section[index('repeatSections')]/bookmark[index('repeatBookmarks')] does
> not point to an existing element, so trying to use a <setvalue> on the
> new node would fail.
>
> Is this interpretation the correct one? If so, a note should be added to
> the draft that says that using index() on nested repeats may lead to
> strange (and unexpected) results.
>
> If this interpration is wrong, because index('repeatBookmarks') should
> return 1 in step 3 because the value of index('repeatSections') changed,
> it should also be specified.
>
> Regards,
> Jérôme
Received on Tuesday, 3 September 2002 11:59:16 GMT

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