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DRAKON is an algorithmic visual programming and modeling language developed within the Buran space project following ergonomic design principles. The language provides a uniform way to represent flowcharts of any complexity that are easy to read and understand.
|Typing discipline||defined by the second language that is part of the selected hybrid language|
|GRAFIT-FLOKS (1996), IS Drakon (2008), DRAKON Editor (2011), DrakonHub (2018), Drakon.Tech (2019)|
|PROL2, DIPOL, LAKS|
|QReal DSM platform|
The DRAKON Editor, which was released in September 2011, is an implementation of the language available in the public domain. It can be used for creating documentation, or for creating visual programs that can be converted to source code in other languages.
Unlike UML's philosophy, DRAKON's language philosophy is based on being augmented if needed, by using a hybrid language, which can be illustrated as "incrustating code snippets from text language used into shape DRAKON requires". This way, DRAKON always remains a simple visual language that can be used as an augmentation for a programmer who is interested in making their own project code easier to support or other long-term needs for example improving the ergonomics of the coding process or to making code easier to review and understand.
The name DRAKON is the Russian acronym for "Дружелюбный Русский Алгоритмический [язык], Который Обеспечивает Наглядность", which translates to "Friendly Russian algorithmic [language] that illustrates (or provides clarity)". The word "наглядность" (pronounced approximately as "naa-glya-dno-st-th") refers to a concept or idea being easy to imagine and understand, and may be translated as "clarity".
The DRAKON language can be used both as a modelling/"markup" language (which is considered a standalone "pure DRAKON" program) and as a programming language (as part of a hybrid language).
Integration of a stricter, "academic", variant of a markup language into programming, such as provided by DRAKON, adds syntactic sugar allowing users of different programming languages to comprehend each other's contributions to the overall project and even provide commentary if needed.
The development of DRAKON started in 1986 and was directed by Vladimir Parondzhanov with the participation of the Russian Federal Space Agency (Academician Pilyugin Center, Moscow) and Russian Academy of Sciences (Keldysh Institute of Applied Mathematics). The language was constructed by formalization, ergonomization and nonclassical structurization of flowcharts described in the ISO 5807-85 standard and Russian standard «Гост 19.701-90» and for the development of real time programs.
The goal was to replace the specialized languages PROL2 (ПРОЛ2) (used for developing onboard complex software for embedded computer system Biser-4 (Бисер-4) on board Buran), DIPOL (ДИПОЛЬ) (used for developing software for the ground maintenance computer system of Buran) and LAKS (ЛАКС) (used for modelling) used in the Buran project with one universal programming language.
This CASE is used since 1996 in many major space programs: an international project Sea Launch, Russian orbit insertion upper stage Fregat (Russian: Фрегат, frigate), upgraded heavy launch vehicle (carrier rocket) Proton-M, etc. The exact role DRAKON played in these projects however can not be determined. The actual real-world experience of building systems with DRAKON remains extremely scarce as only a few very short snippets of code are publicly available.
Family of DRAKON-languages (hybrid languages)Edit
DRAKON (Russian: ДРАКОН; dragon in English) is designed with humanistic ideas in mind, as usage of three different languages for the same project was a source of human factor-related hardships such risks of having a mutual misunderstanding.
DRAKON is used not as a single stand-alone language but as a family of hybrid languages, such as DRAKON-C, DRAKON-ASM, DRAKON-Java, etc. All hybrid languages of the DRAKON-family have the uniform graphical syntax, based on flowcharts. The standard graphical syntax provides similarity of drakon-charts for different hybrid languages. The text language used uses its own syntax.
Strict distinction of the graphical and textual syntax along with rich graphics improves flexibility and variety of expressive means of the language. The unification of the rules of the graphical syntax in the hybrid languages secures their conceptual unity.
The basis of the graphical syntax is a graphical alphabet. Graphical elements (graphical letters) of the DRAKON alphabet are called icons (not symbols). There are 27 icons in the DRAKON graphical alphabet.
DRAKON has not only icons, but also macroicons. Macroicons are the graphical words of the DRAKON language. Just as words are made up of letters, macroiсons (graphical words) consist of the icons (graphical letters). There are 21 macroicons in the DRAKON language.
Icons and macroiсons are the building blocks for constructing drakon-charts.
The important parts of maсroiсons are valence points (in the illustration to the right, they are depicted as little black circles). Into these points, icons or microicons can be successively entered and arranged by drakon-editor in neat, orderly vertical rows.
DRAKON was created as a language with a set of rules that would allow to depict algorithms in fields, not necessarily related to computing, being easy to learn.
- The main reason to the development of the language was emerging risk of misunderstanding, and following errors upon interaction between users of different programming languages in same project (namely, DIPOL, LAX and PROL2, used in the 1980s in Russian space program development).
DRAKON initially uses drakon-chart, which is initially based on a formalization of a traditional flowchart yet with additional functionality for handling code in text language. This technique allows to produce and keep readable flowchart at hand simultaneously with process of making the program in question.
- It is to note a large multi-purpose program with too large drakon-chart may be harder to be comprehended that a set of small programs that serve same purposes separately; similar problem of maintaining code of a single large program is occasionally referred to as "rule of 30 [lines of code]" among programmers.
While DRAKON is designed to be a tool that allows to comprehend purposes of programs in different programming languages, for illustrative, planning and strategy purposes (mirrored to Perl programming language's primary function). Drakoncharts can also be made in spoken language with same tools. Example of medical program on reducing body fat (not translated).
"DRAKON editor" is popular in Russia for being used as a tool for making 'charts without programming language syntax in the medicine field in Russia as a markup language for algorithms of performing actions in certain cases and scenarios. DRAKON allows both create a map-like guide for patients and form instructions for medical personnel.
DRAKON editor takes infographics and flowchart together in a some way: for some purposes DRAKON icons can be augmented a photo inside an icon (which will be placed under icon's text).
The full-text article containing description of the visual syntax of the DRAKON language in English, 12 pages, free to download, pdf.
This section needs expansion. You can help by adding to it. (November 2017)
The DRAKON language full description is represented in Russian book, 520 pages, free to download.
The algorithm of going out of one's apartment:
Check-do (while) loopEdit
The workout algorithm:
Do-check (do-while) loopEdit
Another training algorithm:
DRAKON algorithm execution animationEdit
The picture below illustrated the execution of the silhouette DRAKON algorithm. The algorithm execution is animated by highlighting diagram elements in the running order.
The 'Fishing' silhouette consists of four trees:
- Preparing for fishing.
- Waiting for a bite.
- Fishing work.
- Way back.
The main path of each tree is shown by highlighting thick vertical line which is called a skewer. Note that each path from the "Fishing" Headline icon (start point) to the End icon (stop point) goes smoothly and continuously without any breaks or interruptions. This animation shows that any human can slide his finger along any route from the Headline icon to the End one without lifting his finger (or pencil) from the paper or screen.
It means that silhouette control flow graph always has a path from the Headline icon to each vertex (node) of the control flow graph. Consequently, a silhouette can't have unreachable code in any conditions.
DRAKON Editor is software for making DRAKON flowcharts. It is used for two purposes: documenting algorithms and programming. DRAKON Editor is written in Tcl/Tk and runs on Windows, OS X and Linux. As a documentation tool, DRAKON Editor helps create diagrams that capture algorithmic knowledge. Such knowledge covers both behaviour of computer systems and procedures not directly related to computers, for example medical algorithms and business processes. DRAKON Editor can generate source code from diagrams. This way, DRAKON Editor can be used as an IDE.
The process of editing in DRAKON Editor is based on free drawing. The user inserts and manipulates primitive shapes such as rectangles, vertical and horizontal lines. The user experience is similar to that of business drawing tools. DRAKON Editor does not prevent the user from violating the rules of DRAKON language. It is possible, however, to perform an automated check of the visual syntax at any time.
DRAKON Editor has an alternative editing algorithm, called "smart mode". When in the smart mode, the user can change the visual appearance of the diagram without breaking its topology. In other words, the smart mode allows to fine-tune the layout of the diagram while keeping the underlying algorithm intact.
DRAKON Editor supports the following programming languages:
DRAKON Editor can also generate source code for finite state machines represented with the silhouette construct of DRAKON language.
For Erlang, DRAKON Editor generates boilerplate code from a visual representation of a supervision tree.
DRAKON in the German Aerospace CenterEdit
DRAKON language is used in the German Aerospace Center for implementation of some critical functions dictated by the safety regulations of the flight tests, where automation is important because of maximum distance to the ground station and the process needs quick automatic execution.
The DRAKON Editor software was using to graphically program flowcharts which were specially checked. C-code was generated from the drakon-charts, for instance, for DRAKON representation of launch detection code.
DRAKON language in medical careEdit
The goal of clinical algorithms is to do the right clinical decisions while standardizing and equalizing performance of practitioners. Besides, it improves the quality of health care and minimizes the risk of errors. DRAKON algorithms are ergonomical ones and help to prevent mistakes and ambiguities. DRAKON algorithmic language uniforms medical algorithms and allows complete clinical tasks successfully.
The importance of clinical algorithms in the patient diagnosis, treatment, and intervention is obvious. Similarly, algorithms are useful in education of medical practitioners, especially while working as a team. In order to maximize the utility of algorithms, they need to be simple, inclusive, and ergonomic, so that every user executes a specific algorithm in the identical manner. Medical care requires an instant implementation of latest scientific achievements. DRAKON algorithm can be used for practical “skills and drills” of undergraduate and postgraduate students. The “DRAKON” charts standardize, ensure quality of diagnostic and treatment procedures. It minimizes the possibility of error, thus, increases patient safety.
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- "The ERIL Language". drakon-editor.sourceforge.net. Retrieved 2016-10-04.
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- S. Mitkin. DRAKON: The Human Revolution in Understanding Programs
|Wikimedia Commons has media related to DRAKON.|
- History of DRAKON ‹See Tfd›(in Russian)
- Transhumanism | DRAKON List of Internet Resources about Drakon ‹See Tfd›(in Russian)
- DRAKON + Oberon = DRON visual programming language ‹See Tfd›(in English)
- DRAKON + Oberon = DRON visual programming language ‹See Tfd›(in Russian)
- DRAKON Editor for Windows, Mac and Linux.
- Drakon.Tech an online IDE based on DRAKON.
- ИС Дракон for Windows.
- Learn Drakon Synchronized Music Slideshow Video Slideshow on how to use Drakon set to [Kevin MacLeod] music synchronized for easy learning.