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From docs:<br>
-A <i>multiplex rule</i> creates one <i>transformer</i> that takes
all input artifacts with the matching input file tag and creates one
or more artifacts. <br>
-A <i>simplex rule</i> creates one transformer per matching input
file.<br>
-A <i>transformer</i> takes zero or more inputs and produces one or
more output artifacts from them.<br>
<br>
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?<br>
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