(anti)XMLProcessing : how to render a list of node as a comma separated list of their text ?

Hi all
I need to render something like

data=
<bill>
    <material>eggs</material>
    <material>milk</material>
</bill>

as
output=
"eggs,milk"

at first, I though : "hey that does not look so difficult !!, that will be a
matter of minutes" ...
so I wrote a learning test : 2 minutes
now, I must admit my learning test is still red after 2 hours :(

so, is there anyone kind enough to teach me how to achieve this ??

note 1:
i rapidly produced the following output
"eggs,
milk
"

with template=
<#assign x>
<#list bill.material as x>
${x}<#if x_has_next>,</#if>
</#list>
</#assign>
${x}

but these \n are killing my test !!

note 2:
I'm angry to have to render in the xml output document something like that
<property name="badDesignedDataModel" value="value1, value2, value3"/>
where valueX are identified items in my xml data document
but that is it :)

Regards, Thierry

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