File upload with associate reference to object

Post on URI ( example to associate FILE to row in table TEST_PERM ):

 wfs-data.php/default_db/?SERVICE=WFS&VERSION=1.0.0&SRSNAME=EPSG:3003

<Transaction
  xmlns="http://www.opengis.net/wfs"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  version="1.0.0"
  service="WFS"
  xmlns:p5_objects="https://biuro.biall-net.pl/wfs/objects"
  xmlns:gml="http://www.opengis.net/gml">
  <Insert xmlns="http://www.opengis.net/wfs">
    <TestPerms xmlns="https://biuro.biall-net.pl/wfs/objects">
      <OPIS xmlns="https://biuro.biall-net.pl/wfs/objects">test addFeature p5_objects:TestPerms with p5_objects:File</OPIS>
      <A_STATUS xmlns="https://biuro.biall-net.pl/wfs/objects">NORMAL</A_STATUS>
      <p5_objects:File>
        <p5_objects:name>blank-wfs.gif</p5_objects:name>
        <p5_objects:content>R0lGODlhAQABAIAAAP///////yH+EUNyZWF0ZWQgd2l0aCBHSU1QACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==</p5_objects:content>
      </p5_objects:File>
      <ADM_NAME xmlns="https://biuro.biall-net.pl/wfs/objects">Test Name</ADM_NAME>
    </TestPerms>
  </Insert>
</Transaction>

Result:

<?xml version="1.0" encoding="UTF-8"?>
<wfs:WFS_TransactionResponse version="1.0.0"
  xmlns:wfs="http://www.opengis.net/wfs"
  xmlns:ogc="http://www.opengis.net/ogc"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
  <wfs:InsertResult>
    <ogc:FeatureId fid="TestPerms.49" xmlns:ogc="http://www.opengis.net/ogc"/>
  </wfs:InsertResult>
  <wfs:TransactionResult>
    <wfs:Status>
      <wfs:SUCCESS/>
    </wfs:Status>
  </wfs:TransactionResult>
</wfs:WFS_TransactionResponse>