W3C home > Mailing lists > Public > public-xformsusers@w3.org > April 2012

Re: showing relationships in xforms

From: Erik Bruchez <ebruchez@gmail.com>
Date: Wed, 18 Apr 2012 08:12:20 -0700
Message-ID: <CAAc0PEXbrUVN-NR2wF2TtN6fysxScbcKFkTmz-qc-S3hPswo7g@mail.gmail.com>
To: public-xformsusers@w3.org
Kevin,

The documentation for the Orbeon Forms function library is here:

http://wiki.orbeon.com/forms/doc/developer-guide/xforms-xpath-functions

-Erik

On Tue, Apr 17, 2012 at 10:35 PM, Kevin Flynn <kemifl@gmail.com> wrote:
> Ah, thanks a lot! I never actually tried the example myself - the code I was
> struggling with was too complicated to explain (bad sign?) so I just made
> something up. I was misled by what is obviously old or incomplete
> documentation into thinking current() wasn't available, which set me off in
> the wrong direction. I've fixed the real problem now and will stick to the
> spec as documentation (unless you've got any recommendations to make?). Once
> again, thanks a lot.
>
> Kevin Flynn
>
>
> On Mon, Apr 16, 2012 at 7:44 PM, Erik Bruchez <ebruchez@gmail.com> wrote:
>>
>> Kevin,
>>
>> `current()` is an XForms function, and is supported in Orbeon Forms.
>> It "Returns the context node used to initialize the evaluation of the
>> containing XPath expression." [1]
>>
>> In light of this, since you don't say in which XPath context your
>> expression is running, it's not possible to say what your expression
>> should return in all cases. But this example works:
>>
>> https://gist.github.com/2400248
>>
>> -Erik
>>
>> [1] http://www.w3.org/TR/xforms11/#fn-current
>>
>> On Mon, Apr 16, 2012 at 4:48 AM, Kevin Flynn <kemifl@gmail.com> wrote:
>> > Hi,
>> >
>> > I'm currently experimenting with xforms and having difficulty displaying
>> > information about relationships. Given a data instance like this:
>> >
>> > <persons>
>> >  <person>
>> >   <id>marx</id>
>> >   <name>Karl Marx</name>
>> >  </person>
>> >  <person>
>> >   <id>engels</id>
>> >   <name>Friedrich Engels</name>
>> >   <friend>marx</friend>
>> >  </person>
>> > </persons>
>> >
>> > I would expect to be able to display "Karl Marx" from the context
>> > /persons/person[id='engels'] by doing something like:
>> >
>> > <xforms:output
>> > ref="instance('persons')/person[id=current()/friend]/name"/>
>> >
>> > ....but, needless to say, I can't.
>> >
>> > I realize that the current() function I'm used to from XSLT is not
>> > available
>> > in XForms (I use it above for illustration), but I presume that there
>> > must
>> > be something functionally equivalent... Can anybody enlighten me?
>> >
>> > I'm using Orbeon forms, if that is significant.
>> >
>> > Hope somebody can help
>> >
>> > Kevin Flynn
>
>
Received on Wednesday, 18 April 2012 15:13:19 UTC

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