---------- Forwarded message ----------
From: Balazs E. Pataki <[EMAIL PROTECTED]>
Date: Jun 29, 2006 10:52 AM
Subject: Re: Attribute coders question
To: [EMAIL PROTECTED]
Hi,
For the concatenation question I think I found a solution (see below),
although there might be a more elegant way to do it. I also noticed that
the $ evaluation works very nice and can be nested very well like in
"${v:${v:ix_name}}", which is equivalent with "${v:ix}" in my example,
but anyway, it is cool that I can do it. Thanks for this! :-)
<sequence>
<set field="votes">
<a>
<raw-xml>
<votes>
<vote>
<user id="111">John Smith</user>
<selection>3</selection>
</vote>
<vote>
<user id="222">Dick Foo</user>
<selection>1</selection>
</vote>
<vote>
<user id="3333">Criss Cross</user>
<selection>2</selection>
</vote>
</votes>
</raw-xml>
</a>
</set>
<!-- Concatenate name elements
** Loop with the number of vote elements and concat the
** ${f:votes.e${v:ix}.user.} values and store in the "concat" field.
-->
<set variable="size">
<size><f>votes</f></size>
</set>
<set variable="ix" value="0" />
<!-- Extra, unnecessary hacking. -->
<set variable="ix_name" value="ix" />
<loop>
<if>
<greater-than variable-value="size" other-value="${v:ix}" />
<sequence>
<!-- Simple ${v:ix} access
<set field="concat" value="${f:concat}
${f:votes.e${v:ix}.user.}" />
-->
<!-- ${v:ix} access with an extra reference -->
<set field="concat" value="${f:concat}
${f:votes.e${v:${v:ix_name}}.user.}" />
<inc variable="ix" value="1" />
<set field="__cursor_command__" value="continue" />
</sequence>
<set field="__cursor_command__" value="break" />
</if>
</loop>
<participant ref="dcm-step-xeme-result" />
</sequence>
Regards,
---
balazs
Balazs E. Pataki wrote:
> Hi John,
>
> Sorry for bothering you via email, but SourcForge logins are disabled
> today and I couldn't post my question to the support forum.
>
> I'm learning OWFE these days (I now understand how the REST interface
> works :-), and I found a feature I couldn't find documentation or
> support forum references for.
>
> I try to understand Xeme expression and how to work with workitem payloads:
>
> http://www.openwfe.org/docbook/build/ch06s06.html
>
> As far a I figured out I can work with straight XML or special XML based
> structures like <smap> ... and <list>... My problem is that I couldn't
> find explanation how these actually work, what are their syntax,
> semantics, etc. I only found "smap" "raw-xml" mentioned in
> coder-configuration.xml.
>
> The other related problem I have is how to work with these structures
> ones stored in a workitem field or variable. I understand the basics
> (the Xeme expression), but have problems with the "dollar notation"
>
> http://www.openwfe.org/docbook/build/ch06s10.html
>
> In the "using fields with the dollar notation" section there's an
> example for acessing XML elements and attributes. Where can I find a
> desccription of the supported syntax? Or only the operators in the
> example (".", "eX", "@attrib") exist? Is there, for example, a syntax to
> select more than one element with this dotted $ syntax? For example, if
> I have <name> elements and I want to concatenate all the names. If
> there's nwo such $ notation to help select all names, I guess there's a
> xeme way I can handle it.
>
> I would appreciate any hints!
>
> Best regards,
> ---
> balazs
>
--
John Mettraux -///- http://jmettraux.openwfe.org
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