thank you, it works fine but i have another question.
here are the the 2 first lines

  <?xml version="1.0" encoding="UTF-8" standalone="yes" ?> 
- <VFPData xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="mySchema.xsd">

in the following code, the second line have 3 informations (datedebut,datefin and regroupe). how can i include these informations in this line ?

  <?xml version="1.0" encoding="UTF-8" standalone="yes" ?> 
- <Balance DateDebut="2009-01-01" DateFin="2009-12-31" Regroupe="0">