code: public boolean isNodeType(InternalQName qName) throws RepositoryException
     {
        checkValid();
  
        return session.getWorkspace().getNodeTypesHolder().isNodeType(qName, nodeData().getPrimaryTypeName(),
           nodeData().getMixinTypeNames());
     }
docs: Indicates whether this node is of the specified node type. Returns true if this node is of the
  specified node type or a subtype of the specified node type. Returns false otherwise. <br>
  Nodetype name asked in for mof internal QName.
  
  @param qName
  InternalQName
  @return boolean
  @throws RepositoryException
  if error occurs