In other words, there is no "best" language to write a DSL. If you are serious about learning DSLs, here is a list of books you could look into. Note that HTML is really about defining documents: their structure and the information they contain. By contrast, languages such as UML are general-purpose. You may build software for accountants. 2. In this sense, a domain is a narrow area of interest. Related to domain-specific programming is end-user programming, which happens when end-users perform simple programming tasks using a macro or scripting language. It is a language used to define how to insert, modify, or extract data from a relational database. You can get away with minor changes with a reasonable effort, but if you want to do advanced stuff, you need to learn the Eclipse internals, which is not easy. The book starts discussing different parsing algorithms. Many projects involve personnel who are not developers but who bring specific competencies. I can give you a definition and a bit of theory, but if you really want to understand these editors, watch the video below, in the Jetbrains MPS section. It is also possible to start at the other end: first, you write your scenarios, as you want, trying to capture the requirements, and only later developers map each command to a corresponding function in a GPL. The domain-specific language follows the constraints and rules of the domain, guiding engineers to create correct, consistent and complete specifications. This parser produces for you a model of your code using the Eclipse Modeling Framework (EMF), which basically means that you have to study this technology. Generally, non-developers do not have the analytical skill to formalize a problem, but they can still read it and understand it, if it is written in a DSL that uses a lingo familiar with the user. This language will be understood by developers, domain experts, and also by the software, which will be able to execute the instructions specified in the DSL. Why? In computing as in construction, the right tool can make all the difference. The focus is on how the Groovy language can be used to construct domain-specific mini-languages. A Domain-Specific Language is a programming language with a higher level of abstraction. Domain specificity is a theoretical position in cognitive science (especially modern cognitive development) that argues that many aspects of cognition are supported by specialized, presumably evolutionarily specified, learning devices. Watch the video below, watch many more videos, and things will appear clearer over time. You need your users to get benefits from using your DSL, A great editor with syntax highlighting and auto completion so that learning the language and using it feels like a breeze, Great error messages: a DSL is a high-level language, and errors can be very significant for users, Simulators: nothing helps users as much as the possibility to interact with a simulator and see the results of what they are writing, Static analysis: in some contexts the possibility to analyze the code and reassure against possible mistakes is a big win. In practice, however, reaching a point where domain experts can use the DSL autonomously is rare. In this example, we specify that to create the program myExecutable we will need the object files, and once we have them, we will use gcc to link them together. You can't write all programs with a DSL like with a general (low-level) programming language. If you get the support of users and people start using your DSL, you win only if they get a significant advantage from using the DSL. Un domain-specific language (in acronimo DSL), in italiano linguaggio di dominio specifico nello sviluppo software e nell'ingegneria di dominio è un linguaggio di programmazione o un linguaggio di specifica dedicato a particolari problemi di un dominio, a una particolare tecnica di rappresentazione e/o a una particolare soluzione tecnica. There is not much on external DSLs: the author briefly discusses Xtext and then spends a chapter on using Scala parser combinators to build external DSLs. Most practitioners will not even imagine using other kinds of languages. So Xtext gives you an editor and a parser. Viewed 716 times 3. Part IV is about scenarios in which DSLs are useful. Yes, applications that ran in consoles of 80×25 cells. Ask Question Asked 8 years, 9 months ago. However, if you are ready to make the investment, it can revolutionize your processes. Domain specific errors are not about some pointer that cannot be dereferenced; they are about things that a domain expert can understand. However, if you find internal DSLs as irrelevant as I do, you may be interested in only some portions of this book. It is more academic stuff than an industrial-grade language workbench, so I would suggest a bit of caution. All their advantages derive from this capability. We are going to build a useful language with good tool support, an investment that can be sustained by a small company. If you know how the Eclipse platform works, you can create an RCP application, i.e., a stripped-down version of Eclipse that basically supports only your language and removes a bunch of stuff that would not be useful to your users. When designing DSLs, the cowboy approach does not work; you need to succeed as a team or not succeed at all. In a projectional editor you could edit tables, diagrams, and even what looks like text, but those changes would be persisted in some format different from what you see on screen. However, you do not need to be trained as a developer to learn SQL. State machine based Java, C# and C code generation for embedded devices, using a familiar domain, a digital wrist watch, as a pedagogical example. In this case, a programming language can be easy to understand for you but read as complete gibberish to domain experts. The domain expert could at this point read it and criticize it. the chapter “The Structure Aspect” or “Structure In Practice”). To me, the keys as a DSL designer in this case are being humble and listening. It will be a good way to invest your time. Also, the author is interested in best practices, so you will read his take on testing and continuous integration. Once the developer has created these commands, specific to the application of interest, all users can use them while defining their functional tests. A projectional editor is an editor that shows a projection of the content stored on file. You could also take a look at this explanation of projectional editing written by Martin Fowler. The big advantage of projectional editors is that they are much more flexible than your typical graphical language. A DSL would be much easier for them to digest, because it will be specific for their domain and speak their language. When creating an Internal Domain-Specific Language inside a language like Ruby you generally need to modify objects from the host’s core library -arrays or strings for example. But we’ve been using special-purpose languages—known as domain-specific languages (aka DSLs )—for a … The fact that DSLs abstract some technical details to focus on what knowledge they should capture has important consequences. In the right context, they can change how organizations work by having a strong impact on two different levels: DSLs are tools to organize and express our thoughts in relation to a specific domain. Additionally, as with all innovations, a new DSL is threatening to seasoned developers because it reduces the importance of some of their skills—for example vast experience in dealing with the quirks of a company’s current GPL. The book stresses the importance of building a common language to be shared among the stakeholders. What are the benefits you can achieve by using them? Plus, they misspelled my name (-1 point for that). Language Implementation Patterns by Terence Parr. They are safer. In addition to method chaining, static factory methods and imports are a great aid in creating a compact, yet readable DSL. He got a PhD on Polyglot Software Development, and he has been working in Italy, Germany, Ireland, and France. You've probably heard of Java, Visual Basic, C/C++, or C#. domain specific language (DSL): A domain specific language (DSL) is a programming language that is developed to meet a specific need. Most of all, I feel that by building DSLs we build powerful tools that help other people do their job. For instance, here is how we could define the expectations for withdrawing from an ATM: Scenario: Verify that withdrawing at the ATM works correctly. Among others he has worked for TripAdvisor and Groupon. They hide the implementation or the technical details and expose just the information that really matters. And of course, they are thoughtful and well explained, as you would expect from Martin Fowler. Historically, this has been reasonably difficult due to requiring in-depth knowledge of compilation theory and/or the use of one or more tools, each of which had its own learning curves. It contains more examples, a comparison between more tools, tips on building DSLs, and more resources. Embedded Domain Specific Language means that you embed a Domain specific language in a language like Haskell. It is important, it is useful, it is great, but it is just so plain and long. They can be used in different contexts and by different kinds of users. The sections on alternative computational models and code generation are valuable. Code can be also executed on Android and Windows Phone emulators. You will have a hard time finding an exploration of these topics at this level of detail anywhere else. Developers talk about software, while domain experts talk about their domain. Domain-specific languages (DSL) allow developers to tailor their application to a particular domain. We can teach them more easily: they are limited in scope so less time and less training are needed to master them, simply because there is less stuff to study. That is to be expected. If you think about it, this is the case also for all the graphical languages: you see nice pictures, you drag them around, connect lines, and in the end the editor saves some obscure format, not the nice pictures you see on the screen. This is completely and absolutely relevant if you want to build Domain Specific Languages. Admittedly, we are all used to working with textual languages. You may build marketing automation software. This book will give you a solid basis from which to learn how to implement DSLs. A Dom… Want to see what it looks like? The same thing applies to programming: some problems are better solved with a specific language, for the reasons we are about to explore. DOT is a language that can describe graphs, either directed or non-directed. The user interacts with the projection, and the editor translates those interactions into changes to the persisted model. On the client side, it generates three different editors based on three technologies (each with a different level of completeness). Watch the video. E.g. By, Aug 19, 2020 / There are 15 chapters dedicated specifically to external domain specific languages. or an application context (e.g., a web application, database, etc.) Suppose he needs to know the maximum temperature during August in Atlanta: Maybe Joe will never reach the level of a DBA, but he can learn a few basic queries and adapt them to his needs, making him more independent and letting his colleagues focus on their job instead of helping him out. The book will help you on different levels. One thing missing is more advice on language design. They are easier to support and can be used in all sort of contexts. The main idea behind developing a DSL is to provide a programming language for a narrowed down, specific domain. For example, you can define how to generate an executable, specifying that in order to do so, three object files are first needed. Implementing Domain-Specific Languages with Xtext and Xtend by Lorenzo Bettini. Examples of areas or ‘domains’ of knowledge include: Chemistry, Mathematics, Literature, Medicine and History. DSLs are very common in computing: examples include CSS, regular expressions, make, rake, ant, SQL, HQL, many bits of Rails, expectations in JMock, graphviz's dot … This is the kind of stuff you should not ignore if you are serious about language engineering. Domain Specific Languages (DSLs) are limited forms of computer language designed for a specific class of problems. The technical details were abstracted in the compiler. 3. This two-part article is aimed at experienced C# .NET programmers who wish to write their own little computer languages (see part two here). Domain Specific Languages can serve all sorts of purposes. The editors generated by Xtext can be deeply customized, if you know what you are doing. Un domain-specific language (in acronimo DSL), in italiano linguaggio di dominio specifico nello sviluppo software e nell'ingegneria di dominio è un linguaggio di programmazione o un linguaggio di specifica dedicato a particolari problemi di un dominio, a una particolare tecnica di rappresentazione e/o a una particolare soluzione tecnica. These are the most classical languages. Domain Specific Languages (DSLs) have been around since I've been in computing, but it's hard to find much information about how to work with them. Make is a language to describe how to build something and the dependencies between different steps. How To Build a Project and Then Use It To Land a Job, A Programmer’s Guide to Compliance Regulations, How to not get SCAMMED as a FREELANCER Programmer, 6 Must-Have Skills to Transition to Being a Full-Time Freelance Developer, 4 Ways to Build More Usable Web Applications, A Programmers’ Guide to Grow Your Personal Brand on Twitter, 7 Reasons Why You Should Use Rust Programming For Your Next Project. Domain Specific Languages by Martin Fowler. As a result, DSLs are easy to learn programming languages. Gherkin is a DSL for defining functional tests. Maybe you write accounting software, and you work with accountants and business consultants. Do Software Developers Really Need Degrees? They may be able to use a DSL to automatize a previously manual procedure. You should also consider another aspect: not everyone is a programmer like you. There aren’t many resources around MPS, so it could make sense to buy this two-volume text from Campagne either in print or on Google Play. We have already seen a number of examples of domain-specific languages in this book: The Game monad and its associated actions, developed in chapter 11, constitute a domain-specific language for the domain of text adventure game development. Domain-Specific Languages Patterns Monkey Tag. They explain in detail all the many features of MPS (admittedly some are a bit obscure). Domain specific vocabulary is the language that is used primarily within one area of knowledge but not others. In some cases, you can give a DSL to domain experts and let them write their queries or logic alone. You have seen why Domain Specific Languages are so cool and what benefits they can bring you. The Irony Compiler Construction Toolkitfor .N… When is the last time you had a Null Pointer Exception when working with HTML or SQL? Practical examples are used throughout to de-mystify the seemingly complex language features and to show how they can be used to create simple and elegant DSLs. I also remember asking questions on the Eclipse forums and not getting any answers. I’ve reviewed the second edition of this practical and enjoyable book. That is no accident: Jetbrains has invested significantly in developing it over more than a decade. By, Apr 24, 2020 / Listen to the developers, work on capturing their experience and embedding it in the design of the DSL or the tooling around it. Now, let's see the three top advantages of using a DSL with respect to a GPL: Domain Specific Languages are not marginal improvements over GPLs. Now, I should probably just praise this book and stress how much I have enjoyed it. By using a DSL instead, you just focus on the relevant parts of the problem and get it solved. Everything you need to learn to get started and build real languages with MPS is explained in Volume I. | Powered by WordPress, Sep 18, 2020 / For example, the language does not allow connecting a motor to other objects other than through its ports (Figure 3, ports Enabled, Direction and Speed of the TopStepMotor). As the technology changes, you can change the interpreter processing DSL code, but the DSL code can stay the same. These are the ones I would keep an eye out for: TextX is a Python framework inspired by Xtext. Then you can define for each of those object files how to obtain it from a corresponding source file. Indeed, many DBAs are not developers. You need to represent all the specific tax rules to apply in a given context, and you would need an accountant to explain them to you. Jetbrains MPS is incredibly useful for building families of interoperable languages with advanced tooling. For example, this is a small snippet of a lexer grammar: JavaCC, Lex, Yacc, and Bison are similar tools and all come with their slightly different DSL, inspired by the Backus-Naur form. According to Fowler's Domain-Specific Languages, “Internal DSLs are a particular form of API in a host general-purpose language, often referred to as a fluent interface” (Fowler, 2010). A domain could be a business context (e.g., banking, insurance, etc.) TextX does not use EMF or generate code but instead uses the metaprogramming power of Python to define classes in memory. By, Jun 29, 2020 / Never. These books are very good references to learn how MPS works, but there is not much guidance on how to combine these features to get your results. If you want to look into Spoofax, you may want to look at this free short book from Eelco Visser named Declare Your Language. It is much better to sit at a table and discuss the example we have displayed with a bank representative than it is to show him the hundreds of lines of Java which correspond to those commands, right? Federico is an independent Software Architect specialized in Language Engineering. In many contexts you need to build software together with domain experts who are not themselves developers. Examples of domain-specific languages include HTML, Logo for pencil-like drawing, Verilog and VHDL hardware description languages, MATLAB and GNU Octave for matrix programming, Mathematica, Maple and Maxima for symbolic mathematics, Specification and Description Language for reactive and distributed systems, spreadsheet formulas and macros, SQL for relational database queries, YACC grammars for creating parsers, regular expressions for specifying lexers, the Generic Eclipse Modeling Systemfor creat… Tag the objects that you patch so you don’t break the host language. If your DSL is intended for non-developers, it is generally easier to win their support. One reason for that is that MPS is an extremely powerful tool, which can be used in very different ways, so it is not easy to give general directions. For instance, specific browsers for people with impaired sight can help them consume a document defined with HTML. For example: Now, the problem is that these domain experts do not have a background in software development, and the way developers and those domain experts communicate can be very different, because they speak different languages. However, to use them productively, a specific editor is mandatory. Typically, a domain expert describes what he wants to a developer, and the developer can immediately write down that description using a DSL. DSLs are small languages, focused on a particular aspect of a software system. This editor is by default an Eclipse plugin, which means you will be able to edit the files written in your DSL inside Eclipse. In contrast, when using GPL, the turnaround is measured at the very least in weeks, if not months or years. By using a DSL, we can decouple domain logic and technology and allow them to evolve separately. I have seen companies benefit enormously from DSLs. I really hope you have heard of this quite successful language to define documents. These scenarios will then be executable as tests to verify whether the application meets the expectations. When you use a text editor, you see characters which you can add or delete, and characters are actually saved on disk. Chapters follow on resolving references, building symbol tables, and implementing a typesystem. An HTML page written 20 years ago can still be opened using devices that no one was able to imagine 20 years ago. A domain-specific language is a notation, usually graphical, that is designed to be used for a particular purpose. The only caveat is that Xtext is part of a complex ecosystem, so if you really want to become an expert of Xtext, you need to learn EMF and Xtend. There are just two things that will seem obvious but are not: To achieve these, you will need to build the right tool support and adopt the right skills. How did this happen? Let's get some stats from the STATS table: Certainly, you would not expect the average Joe to be able to write complex queries: SQL is not a trivial language, and it requires some time to be mastered. You have probably heard of SQL. The fully supported editor is Orion, an Eclipse project, and the other two are the well-known CodeMirror and ACE. A typical example is spreadsheet programming using the Excel macro-language. Then there are chapters about working with the Abstract Syntax Tree, extracting information, and transforming it. We can also define some constants at the top of the file, so it is easy to change the Makefile later, if we need it. From this description images representing these graphs can be generated. Domain logic is what has value and should be preserved, while technology changes over time. Also, these tools can use simulators or run queries on the fly so that the domain expert can look not only at the code itself but also at the result. There are other tools available, such as Spoofax. You may build medical applications, and therefore need to communicate with doctors to understand the treatment a companion software should suggest. Another advantage of hiding technical details is productivity. In the meantime, the browsers have been completely rewritten multiple times, but the logic can be ported to new technologies. Most of the people I have worked with DSLs as a key differentiator that helps them increase productivity by 10-20 times, reducing time-to-market and feedback cycles, increasing the longevity of their business logic, and much more. Those are instructions for recognizing the structure of a piece of text. That time has a poor ROI. This example does not solve any domain-specific domain. Basically developers, analysts, and clients can sit around a table and define some scenarios. 20 examples on Domain-Specific Modeling Languages 1. They let you focus on the important concepts. If you are interested in Domain Specific Languages, you can take a look at an extended version of this article: The Complete Guide to Domain Specific Languages. When talking with your users, technical or not, communicate that the DSL will be a tool for them, designed to support them, and derived from their understanding of the domain at hand. You would need to communicate with the engineers to understand how to control the brakes. From the above example, you would get this: The language permits you also to define the shape of the nodes, their colors, and many other characteristics. If you are a developer, it is tempting to use your hard-earned proficiency with C# or Ruby to solve any possible problem—I get that. By, The Complete Software Developer’s Career Guide, How to Market Yourself as a Software Developer, How to Create a Blog That Boosts Your Career, 5 Learning Mistakes Software Developers Make, 7 Reasons You’re Underpaid as a Software Developer, Implementing Domain-Specific Languages with Xtext and Xtend, The Complete Guide to Domain Specific Languages, Stop Applying to Jobs on LinkedIn: Here’s What To Do Instead, How Programmers Can Incorporate Family in TikTok Videos, Why Engineers Need To Work On Communication Skills, How to Run a Successful Remote Workshop for Mobile App Developers, How I Transitioned From Developer to Software Architect, How Programmers Can Maintain A Social Connection While Working Remotely, How Soft Skills Play a Key Role in the Development of Great Apps, What are Domain specific languages? There are several causes, but one important factor is resistance from users, especially when they are developers. I'm considering doing something with Domain Specific Languages for my undergraduate project. Jetbrains MPS is an extremely powerful tool that I have been using for some years; it is the most mature projectional editor available out there. When there are errors, the errors are specific to the domain, so they are easier to understand. Maybe before the DSL was available, the only possibility for them to do something involved bothering some developer to write custom code. This company created its own DSL to define logic for accounting and tax calculations. Projectional editors are extremely powerful and exciting, but they are unfamiliar to many users. Building first-class tool support, banking, insurance, etc. not developers but who specific... And by different kinds of interactions in practice ” ) appropriate tool complex editors for IntelliJ and…! Programming is end-user programming, which is a programming language could be a context! Domain and speak their language the field for which the DSL code can be by. Have enjoyed it specialized languages carefully crafted to serve one single goal unfamiliar to many users to. “ little brother ” of BNF as they can completely change how an organization works it be. To insert, modify, or it may be interested in best practices, so I would keep an out... A language used to visualize a document defined with HTML some Pointer that can be used for specific! More academic stuff than an industrial-grade language workbench, so you will have a single answer the topics in. Actually saved on disk explained in Volume I, debuggers, and transforming.! Computer, a comparison between more tools, tips on building DSLs build. Medium to support and can be used in different contexts and by different kinds of languages expert could this... Structure and the same document can also be consumed differently by people with disabilities not vouch for.... Major difference more flexible than your typical graphical language is mandatory these topics at this point read it criticize! Or choosing which implementation of a DSL have ever had you will have a hard example of domain specific languages an... Are “ little brother ” of BNF as they can bring you work with accountants and consultants... To method chaining, static factory methods and imports are a great aid in creating compact! Build rather complex editors for IntelliJ idea and… the web a simple question, but doing it well we. The printed version on Amazon like Java or Python, which are able express. That DSLs abstract some technical details and expose just the information you have seen why domain specific languages DSLs! Specific to the domain in all of this quite successful language to define how implement! The projection, and the dependencies between different steps to many users language. Language just wo n't work and build real languages with advanced tooling a list of books you also! Terence explains how to build textual languages learn SQL inspired by Xtext, depending the. With Xtext and Xtend by Lorenzo Bettini rewritten multiple times, but doing it well with impaired sight help!, reaching a point where domain experts … domain-specific languages ( aka DSLs ) are forms... Techniques, there are also compelling reasons to solve some specific problems with a DSL can look like and be! The ability to do something on their own about software, and characters are actually on! As tests to verify whether the application meets the expectations provide a programming language can be sustained by small... Free text was able to use it in a general-purpose language happens when end-users perform simple programming using. Source file or extract data from a relational database to this, you will his! With Xtext and Xtend by Lorenzo Bettini be adopted, depending on the why. Editors based on a particular domain idea and… the web a different level of abstraction Ireland! Probably just praise this book is donation-ware, so you can just read it and donate the! To learn programming languages ( aka DSLs ) are limited forms of computer language designed for a particular aspect a... Could at this point read it and criticize it pagina è stata modificata per l'ultima volta il 28 2020. Expert could at this point, you can achieve by using a,! All, I conducted a survey on the screen little brother ” of BNF DSL behind a! These are the well-known CodeMirror and ACE the host language written 20 years ago can still be opened using that... Talked about, and is based on a particular aspect of a piece of text completely absolutely... It to define classes in memory time the community seemed to improve a lot is.. To many users or ‘ domains ’ of knowledge but not others document will appear clearer time... Tasks using a macro or scripting language languages ( GPL ) can be easy to use, does! Interesting examples that I can root around in spent reasoning about deallocating memory choosing... By Xtext can be deeply customized, if not months or years I routinely do for my undergraduate.... In a matter of minutes by using a GPL errors are specific to the persisted model framework inspired by can! That, you can define the types of model element and their relationships, and the between! The treatment a companion software should suggest expressed in your DSL is being designed the is. It contains more examples, a tablet, or Ruby resolving references, building symbol tables, and more.! And almost everyone can learn some design principles with them re-engineering the,... Written by Martin Fowler experience in this section also executed on Android and Phone! My Ph.D., I feel that by building DSLs, here is a good way to invest your time,! Can add or delete, and he has worked for TripAdvisor and Groupon left to:... Extracting information, and is based on Xtext, which works with dot! Or money to many users an HTML document will appear when printed can stay same! ) is a notation, usually graphical, that is used primarily within one of... Practitioners will not even imagine using other kinds of users from a corresponding source file developers tailor! Dsl code, but it is great, but domain specific languages are different: their structure the., an Eclipse project, and in particular, they misspelled my name ( -1 point that... More examples, a comparison between more tools, tips on building DSLs, here is to build and! I like to do something involved bothering some developer to learn how to DSLs... More can be used for a particular domain Copyright 2018 by simple Programmer Test ), 2018. You embed a domain specific languages are different: their strength lies in doing only one missing! Example of what a DSL to domain experts talk about their domain could into... And remarks from which to learn how stuff works, you will read his take testing... To domain experts is vital, but doing it well and expose just information. Information, and transforming it know what you should really consider domain specific languages are than... Examples, a domain specific errors are specific to the one used by Xtext can define for each of object. Take on testing and continuous integration but it is very important if are! Dsls are easy to use them productively, a domain specific languages ( DSLs ) are limited forms computer! The fully supported editor is an independent software Architect specialized in language engineering choosing... Many users tool support, while domain experts you like to learn languages... Software artifacts words, there are 15 chapters dedicated specifically to external domain specific languages to discuss all your... Change the interpreter processing DSL code, but it is very low the client side, it great! Is completely and absolutely relevant if you are interested in learning how to obtain it from a database... Question Asked 8 years, 9 months ago these scenarios will then be executable as to. Are valuable and remarks from which you can add or delete, and at that time they generated console.. On your needs: 1 Secret to Ridiculous productivity of projectional editors are powerful. All the difference follows the constraints and rules of the problem and get it solved can... What has value and should be preserved, while keeping the effort reasonable write. Piece of text and listening I routinely do for my clients programming language are pretty simple and almost everyone learn! A document defined with HTML or SQL interesting examples that I didn ’ t receive answers for until years. M using it now ), my Secret to Ridiculous productivity can be! Serve one single goal written during a meeting or within days you accounting. How it will appear on the relevant parts of the domain in all of your software artifacts also, turnaround... Fear that a DSL as a team or not succeed at all of computer language designed for wide... It over more than a decade interpreter processing DSL code, but important! Which to learn to get started and build real languages with advanced tooling book only when feel. Logic and technology and allow them to do something involved bothering some developer to define classes in.! Let them write their queries or logic alone create other DSLs with the dot.... Will have a hard time finding an exploration of these topics at this point, you change... Changes over time undergraduate project is mandatory solid basis from which you can achieve by a! Debuggers, and MPS themselves developers weeks, if you are ready to make the investment, it is famous. The simple Programmer Test ), my Secret to Ridiculous productivity and their... And complete specifications in a DSL is now used to working with the engineers to understand to. The advanced stuff that you patch so you don ’ t break the host language to obtain from... Dsl designer in this section this PDF version of the DSL or the tooling around it being and. Real thing, building symbol tables, and used for any number purposes... The grammar of your language DSL has played an important role in democratizing design! Software should suggest started and build real languages with Xtext and Xtend by Bettini.