Created attachment 24073 [details]
The original XLSX file

Hi,

I've tried the new tool to import XML into XSLSX files using the Custom XML mapping and I found a problem.

If you load an XSLS file, import data from XML and then save the XLSX back to file, the xmlMaps.xml part becomes corrupted.

I've attached two XLSX file to show the problem.

If you open the original xmlMaps.xml file it looks like this:

<Schema 
   ID="Schema13" 
   Namespace="http://schemas.openxmlformats.org/spreadsheetml/2006/main">
   
  <xsd:schema 
    targetNamespace="http://schemas.openxmlformats.org/spreadsheetml/2006/main"
    elementFormDefault="qualified"
    xmlns="http://schemas.openxmlformats.org/spreadsheetml/2006/main"  
    xmlns:xsd="http://www.w3.org/2001/XMLSchema">


while the file saved from POI looks like this:

<Schema 
   ID="Schema13" 
   Namespace="http://schemas.openxmlformats.org/spreadsheetml/2006/main">
   <xsd:schema 
      targetNamespace="http://schemas.openxmlformats.org/spreadsheetml/2006/main"
      elementFormDefault="qualified" 
      xmlns:xsd="http://www.w3.org/2001/XMLSchema">


It seems that the xmlns attribute of the inner xsd:schema element is removed by XMLBeans (I don't know if it's not saved or not readed from the original file).