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Re: Evaluation context

From: Erik Bruchez <ebruchez@orbeon.com>
Date: Tue, 20 Dec 2016 21:18:19 -0800
Message-ID: <CAAc0PEU9pFH4V49yM2Zr28wg7RXNkoYb7rETO=X2UX-DE-n1RQ@mail.gmail.com>
To: Steven Pemberton <steven.pemberton@cwi.nl>
Cc: XForms <public-xformsusers@w3.org>
> AVTs: do we agree? (The spec examples are inconsistent, so we have to
> decide). Which of these two is right?
>         <output ref="total" class="{if (total ge 0) then 'positive' else
> 'negative'}" />
>         <output ref="total" class="{if (. ge 0) then 'positive' else
> 'negative'}" />

We do the latter: relative to @ref (or @bind: that is relative to the
binding when present).

Another way to look at it is that attributes which evaluate XPath
expressions work like expressions on nested elements (except @origin as you
pointed out).

How about with:
>         <itemset model="flavors" ref="flavor" label="{description}"
> copy="description"/>
> (which is using (dynamic) element context).

So same here, `description` is relative to `flavor`.

select/itemset/@copy: Element or in-scope?


> setindex/@index: Element or in-scope?

There is no @ref/@bind on `setindex`, but there could be a @model or
@context. So relative to that.

> insert/@at, delete/@at: I'm pretty sure that this means the element
> context.

I would say that too.

(I have my own feelings about these, but I don't want to prejudice your
> thinking).
> One other thing: I assume that it is right that context() returns the
> in-scope context as specified in
> https://www.w3.org/community/xformsusers/wiki/XPath_Expressi
> ons_Module#The_context.28.29_Functio
> <https://www.w3.org/community/xformsusers/wiki/XPath_Expressions_Module#The_context.28.29_Function>



> Steven
Received on Wednesday, 21 December 2016 05:19:12 UTC

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