clarify relation of tasks and plans
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@ -13,21 +13,21 @@ Nix consists of hierarchical [layers](https://en.m.wikipedia.org/wiki/Multitier_
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| evaluates | manages
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V |
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[ configuration language ] |
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| V
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+-------------------------------|---------------------------------+
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| store | |
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| | evaluates to |
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| | |
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| referenced by V builds |
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| [ build input ] --> [ build task ] --> [ build result ] |
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| |
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| |
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+-------------------------------|---------------------V-----------+
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| store | evaluates to |
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| .............................V............................... |
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| : build plan : |
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| : referenced by builds : |
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| : [ build input ] --> [ build task ] --> [ build result ] : |
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| :...........................................................: |
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+-----------------------------------------------------------------+
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```
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At the top is the *command line interface*, translating from invocations of Nix executables to interactions with the underlying layers.
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Below that is the *Nix language*, a [purely functional](https://en.m.wikipedia.org/wiki/Purely_functional_programming) configuration language.
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It is used to compose expressions which ultimately evaluate to self-contained *build tasks*, used to derive *build results* from referenced *build inputs*.
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It is used to compose expressions which ultimately evaluate to self-contained *build plans*, made up *build tasks* used to derive *build results* from referenced *build inputs*.
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::: {.note}
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The Nix language itself does not have a notion of *packages* or *configurations*.
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@ -40,4 +40,3 @@ The command line and Nix language are what users interact with most.
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Underlying everything is the *Nix store*, a mechanism to keep track of build tasks, data, and references between them.
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It can also execute *build instructions*, captured in the build tasks, to produce new data.
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A series of build tasks is a *build plan*.
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