(({2))}
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The templates P1 and P2 simply return the first respectively second unnamed input parameter respectively. For example:
((P1|foo|bar|baz))
returns foo((P2|foo|bar|baz))
returns barThese templates can be used inside other templates as an alternative to the ((#switch)) parser function, to switch between outputs based on whether the input is "1" or "2":
((P(({1))}|output if 1|output if 2))
Using ((#switch))
, this syntax is equivalent to
((#switch:(({1))}|1=output if 1|2=output if 2))
except that the parser function strips whitespace between parameters whereas the templates don't.