Hi Jens, I found out what the "mb:bean" notation is... its just a custom binding
In tapestry we can specify such notations "prop:myProperty" In this case... the framework I am using TYNAMO implements a new binding called ModelBinding and it gets facilitated by a ModelBindingFactory. package org.tynamo.bindings; public class ModelBindingFactory extends PropBindingFactory implements BindingFactory { public ModelBindingFactory(PropertyConduitSource propertyConduitSource, StringInterner interner) { super(propertyConduitSource, interner); } @Override public Binding newBinding(String description, ComponentResources container, ComponentResources component, String expression, Location location) { return new ModelBinding(super.newBinding(description, container, component, expression, location)); } } public class ModelBinding implements Binding { private final Binding binding; public ModelBinding(Binding binding) { this.binding = binding; } public Class getBindingType() { Object object = binding.get(); if (object == null) throw new NullPointerException("ModelBinding's value can't be null!"); return object.getClass(); } public Object get() { return binding.get(); } public void set(Object value) { binding.set(value); } public boolean isInvariant() { return binding.isInvariant(); } public <T extends Annotation> T getAnnotation(Class<T> tClass) { return binding.getAnnotation(tClass); } }