code: public String[] getMixinTypeNames() throws RepositoryException
     {
        NodeType[] mixinTypes = getMixinNodeTypes();
        String[] mtNames = new String[mixinTypes.length];
        for (int i = 0; i < mtNames.length; i++)
        {
           mtNames[i] = mixinTypes[i].getName();
        }
  
        return mtNames;
     }
docs: Return mixin Nodetype names.
  
  @return String[]
  @throws RepositoryException
  if error occurs