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14 lines
921 B
Plaintext
14 lines
921 B
Plaintext
created: 20150117204109000
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modified: 20150917193713204
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tags: Filters
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title: Selection Constructors
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type: text/vnd.tiddlywiki
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The output of a [[filter|Filters]] step depends on its [[operator|Filter Operators]]:
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* Most operators derive their output from their input. For example, many of them output a subset of their input, and thus truly live up to the name of <<.word filters>>, narrowing down the overall output of the containing [[run|Filter Run]]. These operators are called <<.def "selection modifiers">>.
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* A few operators ignore their input and generate an independent output instead. These are called <<.def "selection constructors">>: they construct an entirely new [[selection|Title Selection]].
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A good example of a constructor is <<.olink title>>. The output of `[title[A]title[B]]` is just <<.tid B>>. But the <<.olink field>> operator is a modifier, so `[title[A]field:title[B]` outputs nothing at all.
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