Contains markup and other components, and defers rendering of its body until invoked by a RenderBlock .
Informal parameters: forbidden
Reserved parameters: none
When a Block component renders normally, it does absolutely nothing. It doesn't render any tag, or render its body. However, a RenderBlock component can be passed a Block instance, which will trigger the Block to render its body.
The parameters of the RenderBlock , including informal parameters, are indirectly available to the Block component. The OGNL expression components. block .getParameter(" name ") returns the value of a parameter bound to the RenderBlock which invoked the rendering of the Block's body.
The RenderBlock component has an extensive example.