[QBS] What is the semantic difference between Rule and Transformer?

[Stéphane Fabry]

A transformer can be used without input, just to produce an output 
artifact from nothing.


Le 08-11-14 14:44, Tim Hutt a écrit :
>
> As far as I can see, a Transformer isn't aware of file tags - they act 
> on specific file names rather than file types, but yeah they seem to 
> overlap a lot and the use case for Transformers isn't totally clear 
> from the documentation.
>
> On 8 Nov 2014 13:39, "Smirnov Vladimir" <mapron at yandex.ru 
> <mailto:mapron at yandex.ru>> wrote:
>
>     From docs:
>     -A /multiplex rule/ creates one /transformer/ that takes all input
>     artifacts with the matching input file tag and creates one or more
>     artifacts.
>     -A /simplex rule/ creates one transformer per matching input file.
>     -A /transformer/ takes zero or more inputs and produces one or
>     more output artifacts from them.
>
>     So I can imagine that Rule wraps some Transformer's functionality.
>     But why don't just use only Rules? What can i do with Transformer
>     that Rule couldn't cover?
>
>
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*Stéphane Fabry*, Project & IT Manager
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*X-RIS* | /X-Ray Imaging Solutions/
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