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Date: Fri, 13 Jul 2007 17:43:15 -0400
From: "Rahul Akolkar" <rahul.akolkar@gmail.com>
To: "Jakarta Commons Users List" <commons-user@jakarta.apache.org>
Subject: Re: [SCXML] Difficulties with XPath expression on XML attributes
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References: <cc9610990707131321n5473bd94jf8bd40c735c4d5dd@mail.gmail.com>

On 7/13/07, Ingmar Kliche <ingmar.kliche@googlemail.com> wrote:
> I have difficuties to select a node using XPath. I use an EMMA XML
> repesented input:
>
> <emma:emma version="1.0"
>     xmlns:emma="http://www.w3.org/2003/04/emma"
>     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
>     xsi:schemaLocation="http://www.w3.org/2003/04/emma
>      http://www.w3.org/TR/2007/WD-emma-20070409/emma.xsd"
>     xmlns="http://www.example.com/example">
>   <emma:one-of id="r1" emma:start="1087995961542" emma:end="1087995963542">
>     <emma:interpretation id="int1" emma:confidence="0.75"
>     emma:tokens="flights from boston to denver">
>       <origin>Boston</origin>
>       <destination>Denver</destination>
>     </emma:interpretation>
>
>     <emma:interpretation id="int2" emma:confidence="0.68"
>     emma:tokens="flights from austin to denver">
>       <origin>Austin</origin>
>       <destination>Denver</destination>
>     </emma:interpretation>
>   </emma:one-of>
> </emma:emma>
>
> taken from [1]. This EMMA document is parsed into its DOM and passed into
> the engine (attached to the eventdata). Now I'd like to select the <origin>
> out of the first interpretation. I tried to use the following statement:
>
> <transition event="emma" xmlns:emma=http://www.w3.org/2003/04/emma
> cond="Data(_eventdata.emma,'/emma:emma/emma:one-of/emma:interpretation[@id='int1']/origin')
> eq 'Boston'" target="twenty" />
>
> I think the XPath itself is correct, but unfortunately the overall statement
> is not a valid JEXL statement anymore (as of the ' around "int1"). How
> should I select the value of the attribute to make it a valid statement? I
> tried to escape using \ , but it did not work.
>
> Any suggestion?
>
<snip/>

This nets out to be a JEXL question. It has been asked before a few
[1],[2],[3],[4] times.

JEXL has no elegant way of doing this (you can store an apostrophe in
the state machine's root context and then use it in string
concatenation to get by).

-Rahul

[1] http://www.nabble.com/-scxml--Data%28%29-xpath-and-the-syntax-tf1682372.html
[2] http://www.nabble.com/-jexl--How-to-escape-the-Apostrophe-tf1686607.html
[3] http://www.nabble.com/-Jelly-JEXL--String-concatenation-tf155102.html
[4] http://www.nabble.com/-Jexl--String-Literals-with-Newline-do-not-work-tf4035993.html


> - Ingmar.
>
> [1] http://www.w3.org/TR/emma
>

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