argdown is an actively used text markup language created in 2014.

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Example code from the web:

 # Welcome to Argdown!

 [Intro]: Argdown is a simple syntax for defining argumentative 
 structures, inspired by Markdown.
   + Writing a *pro & contra list* in Argdown is as 
     simple as writing a twitter message (actually we are 
     right in the middle of one).
   + But you can also 
     **logically reconstruct** more complex dialectical 
     relations between arguments or dive into 
     the details of their premise-conclusion structures.
   + Finally, you can export Argdown as a graph and create 
     **argument maps** of whole debates.

 This Argdown document only demonstrates the basic syntax elements. 
 The argument map produced is a "bogus debate". 

 To read a reconstruction of a *real* debate, select one of the 
 **example debates** by moving your mouse to the *"Examples"* button 
 on the upper left, above the text editor.

 ## Argdown Basics

 This is a normal statement with __bold__ and _italic_ text, 
 a #tag and a [link](https://github.com/christianvoigt/argdown-parser).

 [Statement 1]: Another statement (after a blank line), 
 this time with a title defined in square brackets. 
 We can use the title to refer to this statement later 
 or mention it in other statements. #(Another tag)

 [Statement 2]: Let's do that now: The previous 
 statement was @[Statement 1].
   + <Argument title>: Statements can be supported 
     by __arguments__. Arguments are defined by 
     using angle brackets. #tag
   - <Another argument>: This arguments attacks @[Statement 2]. #tag
     - <Yet another argument>: Arguments can also 
       be supported or attacked. #yet-another-tag
       <!--
       By the way,
       this is a multiline comment.
       -->

 We can also do that the other way around:

 [Intro]
   -> <Argument 1>

 Headings can be used to group arguments and statements together. 
 In the map these groups are visualized as grey boxes.

 Tags are visualized by the colors of the arguments and statements in the map.

 ### Argument reconstructions

 So far, we have ignored the internal structure of arguments. Arguments 
 consist of premises from which conclusions are inferred. We can precisely 
 define this premise-conclusion structure with Argdown:

 <Argument 1>

 (1) First premise (this is is a normal statement 
     and you can do everything with it, we have done 
     with the statements above).
 (2) [Statement 2]: We have already defined a statement 
     with this title.
     Argdown allows you to add multiple statements 
     to the same "equivalence class" by giving them 
     the same title. The statements will then be treated 
     as logically equivalent.
 --
 Some inference rule (Some additional info: 1,2)
 --
 (3) And now the conclusion 
   -> Outgoing relations of the conclusion, 
   are also interpreted as outgoing relations of 
   the whole argument.
   +> <Yet another argument>
   <!--
   The second relation is only "sketched",
   because it does not declare which premise
   of @<Argument 2> is supported.
   (At this point this is not possible,
   as we have not yet reconstructed @<Argument 2>)
   -->
   -> [Statement 1]

   We can also link to headings: 
   [Back to top](#heading-welcome-to-argdown)

Last updated December 4th, 2019

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