CROSSTAB from an XML file with iReport / Jasper Report

Hi all,
I need to create a report using crosstab with an XML file. The iReport guide doesn't answer to my problem.
The XML file contents one tag called "HEADERS" with "NAME-HEADERS" corresponding to all column names and different tags called "LINE-DATAS" with corresponding values.
I want to feed column groups with NAME-HEADERS and details with LINE-DATAS.
How can I describe this in a crosstab ?
Thans for your answers.
Richard.

Read this:
http://swforum.sun.com/jive/thread.jspa?forumID=122&threadID=62130
Also there are a lot of stuff at JasperReports forums:
http://sourceforge.net/forum/?group_id=36382

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