document view: importXML() fails on protected property jcr:primaryType

when trying to import an xml document where elements contain the attribute jcr:primaryType the import fails with:

javax.jcr.nodetype.ConstraintViolationException: cannot set the value of a protected property /testroot/docviewimport/doc/jcr:primaryType
at org.apache.jackrabbit.core.PropertyImpl.setValue(PropertyImpl.java:907)
at org.apache.jackrabbit.core.NodeImpl.setProperty(NodeImpl.java:1044)
at org.apache.jackrabbit.core.xml.DocViewImportHandler.startElement(DocViewImportHandler.java:124)
at org.apache.jackrabbit.core.xml.ImportHandler.startElement(ImportHandler.java:164)
at org.apache.xerces.parsers.AbstractSAXParser.startElement(Unknown Source)
at org.apache.xerces.impl.XMLNSDocumentScannerImpl.scanStartElement(Unknown Source)
at org.apache.xerces.impl.XMLNSDocumentScannerImpl$NSContentDispatcher.scanRootElementHook(Unknown Source)
at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl$FragmentContentDispatcher.dispatch(Unknown Source)
at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source)
at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)
at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source)
at org.apache.jackrabbit.core.SessionImpl.importXML(SessionImpl.java:836)
at org.apache.jackrabbit.test.api.DocViewImportTest.setUp(DocViewImportTest.java:92)
at com.intellij.rt.execution.junit2.JUnitStarter.main(JUnitStarter.java:31)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at com.intellij.rt.execution.application.AppMain.main(AppMain.java:78)

if i understand the spec correctly, the import process should take care of this attribute and determine the node type of the new nodes based on it.