use reference links for URLs

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Valentin Gagarin 2022-05-20 23:56:47 +02:00
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@ -5,7 +5,7 @@ It should help users understand why Nix behaves as it does, and it should help d
## Overview
Nix consists of hierarchical [layers](https://en.m.wikipedia.org/wiki/Multitier_architecture#Layers).
Nix consists of [hierarchical layers][layer-architecture].
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@ -29,7 +29,7 @@ Nix consists of hierarchical [layers](https://en.m.wikipedia.org/wiki/Multitier_
At the top is the [command line interface](../command-ref/command-ref.md), translating from invocations of Nix executables to interactions with the underlying layers.
Below that is the [Nix expression language](../expressions/expression-language.md), a [purely functional](https://en.m.wikipedia.org/wiki/Purely_functional_programming) configuration language.
Below that is the [Nix expression language](../expressions/expression-language.md), a [purely functional][purely-functional-programming] configuration language.
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*.
::: {.note}
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Underlying these is the [Nix store](./store/store.md), a mechanism to keep track of build plans, data, and references between them.
It can also execute *build instructions*, captured in the build tasks, to produce new data.
[layer-architecture]: https://en.m.wikipedia.org/wiki/Multitier_architecture#Layers
[purely-functional-programming]: https://en.m.wikipedia.org/wiki/Purely_functional_programming