You may want to read this
http://tapestry.apache.org/tapestry5/tapestry-core/guide/parameters.html


Andy Blower wrote:
> 
> I'm accessing message catalogs using expansion with a prefix. e.g.
> ${message:this-is-my-key}
> 
> 1) Is there a list of prefixes anywhere, or have I got them all now?
> (literal, prop, message)
> 
> 2) Is there a way of accessing a message with a key that's partially
> generated by another expansion? 
> e.g. (this doesn't work obviously, but getProductVariant() is implemented
> in the page class and its output forms the last segment of the message
> key) 
> ${message:product-name-${productVariant}}
> 
> 3) Also how can you pass arguments to the messages to replace {0}, {1}
> etc?
> 
> Thanks,
> 
> Andy.
> 

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