code: public void setType( AstNode node,
                           String type ) {
          CheckArg.isNotNull(node, "node");
          CheckArg.isNotNull(type, "parent");
          node.setProperty(JCR_MIXIN_TYPES, type);
      }
docs: Sets the mixin type property for an {@link AstNode}
  
  @param node the node to set the property on; may not be null
  @param type the mixin type {@link String}; may not be null