XMLProcessing : testing optional value in a NodeModel

Hi all,

I would like to conditionaly provide xml section if some attributes exists
in model

here is my model
<?xml version="1.0" encoding="UTF-8"?>
<connection name="sle-001" template="sle-optional.ftl" saveDir="save">
</connection>

model is parsed using dom api and a NodeModel is made out of it

here is my template
<connections>
	<connection name="${connection.@name}" url="imc:gl:slev42">
<#if (connection.@saveDir)??>
	<property name="saveDir" value="${connection.@saveDir}" />
</#if>
<#if (connection.@optional)??>
	<property name="optional" value="${connection.@optional}" />
</#if>
	</connection>
</connections>

that is, if optionnal attribute exists, there is a such property in 
output


the template processing fails on 

Error on line 7, column 44 in sle-optional.ftl
Expecting a string, date or number here, Expression connection.@optional 
is
instead a freemarker.ext.dom.NodeListModel
The problematic instruction:
----------
==> ${connection.@optional} [on line 7, column 42 in sle-optional.ftl]

did i missed something concerning null values and ?? directive behaviour ?

the first conditional on connection.@saveDir evaluates to "true", as the
attribute does exist in model


Regards, Thierry


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