user-friendly nature of its syntax, designed to be both intuitive and easy to remember. • Intuitive Syntax: First and foremost, users appreciate the straightforward and intuitive syntax that PlantUML employs Note over all participants [across] You can directly make a note over all participants, with the syntax: • note across: note_description @startuml Alice->Bob:m1 Bob->Charlie:m2 note over Alice, Charlie: notes aligned at the same level [/] You can make several notes aligned at the same level, with the syntax /: • without / (by default, the notes are not aligned) @startuml note over Alice : initial state

benutzerfreundliche Syntax zurückzuführen, die sowohl intuitiv als auch leicht zu merken ist. • Intuitive Syntax: In erster Linie schätzen die Benutzer die einfache und intuitive Syntax, die PlantUML verwendet Note over all participants [across] You can directly make a note over all participants, with the syntax: • note across: note_description @startuml Alice->Bob:m1 Bob->Charlie:m2 note over Alice, Charlie: notes aligned at the same level [/] You can make several notes aligned at the same level, with the syntax /: • without / (by default, the notes are not aligned) @startuml note over Alice : initial state

Types Reflection Rewriting Run-time Irrelevance Safe Agda Sized Types Sort System Syntactic Sugar Syntax Declarations Telescopes Termination Checking Universe Levels With-Abstraction Without K Tools Automatic full list of the different background colors used by Agda. Tip If you do not like the way Agda syntax or errors are highlighted (if you are colour- blind, for instance), then you can tweak the settings patterns and co-patterns Core language Grammar Syntax overview Lexer Parser Concrete Syntax Nice Concrete Syntax Abstract Syntax Internal Syntax Treeless Syntax Coverage Checking Single match on a non-indexed

Types Reflection Rewriting Run-time Irrelevance Safe Agda Sized Types Sort System Syntactic Sugar Syntax Declarations Telescopes Termination Checking Universe Levels With-Abstraction Without K Tools Automatic full list of the different background colors used by Agda. Tip If you do not like the way Agda syntax or errors are highlighted (if you are colour- blind, for instance), then you can tweak the settings patterns and co-patterns Core language Grammar Syntax overview Lexer Parser Concrete Syntax Nice Concrete Syntax Abstract Syntax Internal Syntax Treeless Syntax Coverage Checking Single match on a non-indexed

Types Reflection Rewriting Run-time Irrelevance Safe Agda Sized Types Sort System Syntactic Sugar Syntax Declarations Telescopes Termination Checking Universe Levels With-Abstraction Without K Tools Automatic full list of the different background colors used by Agda. Tip If you do not like the way Agda syntax or errors are highlighted (if you are colour- blind, for instance), then you can tweak the settings patterns and co-patterns Core language Grammar Syntax overview Lexer Parser Concrete Syntax Nice Concrete Syntax Abstract Syntax Internal Syntax Treeless Syntax Coverage Checking Single match on a non-indexed

Types Reflection Rewriting Run-time Irrelevance Safe Agda Sized Types Sort System Syntactic Sugar Syntax Declarations Telescopes Termination Checking Two-Level Type Theory Universe Levels With-Abstraction full list of the different background colors used by Agda. Tip If you do not like the way Agda syntax or errors are highlighted (if you are colour- blind, for instance), then you can tweak the settings patterns and co-patterns Core language Grammar Syntax overview Lexer Parser Concrete Syntax Nice Concrete Syntax Abstract Syntax Internal Syntax Treeless Syntax Coverage Checking Single match on a non-indexed

. . . . . . . . . . . . . . . . . . 37 4.1.2 Syntax of Types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 4.1.3 Syntax of Class Assertions and Contexts . . . . . . . . . 127 vi CONTENTS 10 Syntax Reference 129 10.1 Notational Conventions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 129 10.2 Lexical Syntax . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 135 10.5 Context-Free Syntax . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 137 10.6 Fixity Resolution

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53 13 Syntax Extensions 55 13.1 syntax rules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . functional language such as Haskell or OCaml. In particular, a certain amount of familiarity with Haskell syntax is assumed, although most concepts will at least be explained briefly. The reader is also assumed "The answer!" : String 3.2 Data Types Data types are declared in a similar way and with similar syntax to Haskell. Natural numbers and lists, for example, can be declared as follows: data Nat = Z | S

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 160 3.39 Syntax Declarations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . full list of the different background colors used by Agda. Tip: If you do not like the way Agda syntax or errors are highlighted (if you are colour-blind, for instance), then you can tweak the settings which has a special representation as Haskell integers and support for fast arithmetic. The surface syntax of these concepts are not fixed, however, so in order to use the special treatment of natural numbers

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 160 3.39 Syntax Declarations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . full list of the different background colors used by Agda. Tip: If you do not like the way Agda syntax or errors are highlighted (if you are colour-blind, for instance), then you can tweak the settings which has a special representation as Haskell integers and support for fast arithmetic. The surface syntax of these concepts are not fixed, however, so in order to use the special treatment of natural numbers