luatex and xml

[WN <wneimeijer@tiscali.nl>]

Hi,

I am trying to parse a xml file with mkiv to process a list of invoices 
(factuur in dutch).

The xml file looks like this

<?xml version='1.0 standalone='yes' ?>
<factuur>
<nummer>123456789</nummer>
<datum>1 januari 2008</datum>
<medewerker></medewerker>
<regels>
<omschrijving>Omschrijving geleverde dienst a</omschrijving>
<bedrag>1500,00</bedrag>
<omschrijving>Omschrijving geleverde dienst b</omschrijving>
<bedrag>200,00</bedrag>
</regels>
</factuur>

I want to extract and sum the invoices (regels). I managed to get things 
working (printing)
but don't know how to assign these values into lua variables for the 
summing.
The test code looks like this

% engine=luatex
\starttext

\startluacode
document.xml = document.xml or { } -- define namespace
document.xml = xml.load("factuur.xml") -- load the file
n = xml.count(document.xml, "/factuur/regels/omschrijving")

for i = 1, n do
--
-- here I want to assign the values returned by xml.filter into local 
variable amount
--

xml.sprint(xml.filter(document.xml, "/factuur/regels/bedrag/position(" 
.. i .. ")" ))

end
\stopluacode
\stoptext

Kind regards
WN
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