Read an XML file between a repetative nodes and create new xml files from it

I have an xml file. Here I need to read the elements between ImportDocument starting and ending nodes and create a new xml document with those elements and its values. So, for the below xml file, I need to create 3 new xml files.

But before creating a new xml document I need to get values from database for Pernsr and SubmittingPernr element values.

Can anyone has any sample code for this task?

<?xml version="1.0" encoding="UTF-8"?>
-<DmHrImport xsi:noNamespaceSchemaLocation="http://dm-corp.swna.wdpr.disney.com/ImportSchemas/DmHrImport.xsd"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
-<Feed>
      <Interface>000001</Interface>
      <Version>001</Version>
</Feed>
-<Options>
      <Test>N</Test>
      <BatchName>00000120140528502</BatchName>
</Options>
-<ImportDocument>
      <Pernr>00895722</Pernr>
      <SubmittingPernr>00895722</SubmittingPernr>
      <Type>APPLMAT</Type>
      <Application>ACROBAT</Application>
      <FilePath>\files\0000\00895722_1_Emergency Contact Information.pdf</FilePath>
      <DocumentDate>2014-05-15</DocumentDate>
      <Notes/>
</ImportDocument>
-<ImportDocument>
      <Pernr>00895722</Pernr>
      <SubmittingPernr>00895722</SubmittingPernr>
      <Type>APPLMAT</Type>
      <Application>ACROBAT</Application>
      <FilePath>\files\0000\00895722_2_Release of Info & Documentation(College).pdf</FilePath>
      <DocumentDate>2014-05-15</DocumentDate>
      <Notes/>
</ImportDocument>
-<ImportDocument>
      <Pernr>00891102</Pernr>
      <SubmittingPernr>00891102</SubmittingPernr>
      <Type>APPLMAT</Type>
      <Application>ACROBAT</Application>
      <FilePath>\files\0000\00891102_3_Emergency Contact Information.pdf</FilePath>
      <DocumentDate>2014-05-11</DocumentDate>
      <Notes/>
</ImportDocument>
</DmHrImport>