T5: asset: prefix

[Chris Lewis <ch...@bellsouth.net>]

Hello,

I was looking at the Palette source and saw the following param 
annotation for the _source property:

@Parameter(value = "*asset:select.png*")

The only thing I've been able to find about the asset: prefix is on the 
T5 start page, where it mentions that this prefix allows asset files to 
be bound to parameters. Could someone explain this and how it's useful? 
Aside from seeking a better understanding, I'm curious how tapestry 
actually resolves the path to the file, select.png. It would seem that 
this prefix allows one to easily swap in a different image file (for 
theming purposes, etc), but don't understand how it is resolved. Any 
insight is appreciated.