Export creates non-schema-compliant data

<user xmlns="http://midpoint.evolveum.com/xml/ns/public/common/common-2a"
      oid="7eca8910-8289-48ff-8b0b-dd79af10c1f1"
      version="6">
   <name>
      <orig xmlns="http://prism.evolveum.com/xml/ns/public/types-2">michelangelo</orig>
      <norm xmlns="http://prism.evolveum.com/xml/ns/public/types-2">michelangelo</norm>
   </name>
....
   <accountRef xmlns:c="http://midpoint.evolveum.com/xml/ns/public/common/common-2a"
               oid="13d31b84-dafc-439a-9a1a-b79786b787a4"
               type="c:AccountShadowType"/>
   <extension>
      <gen1:artisticName xmlns:gen1="http://prism.evolveum.com/xml/ns/demo/extension-electra">Michelangelo</gen1:artisticName>
   </extension>
</user>