Juha-Pekka Tolvanen

𝐋𝐚𝐧𝐠𝐮𝐚𝐠𝐞 𝐝𝐞𝐟𝐢𝐧𝐞𝐬 𝐰𝐡𝐚𝐭 𝐰𝐞 𝐜𝐚𝐧 𝐛𝐮𝐢𝐥𝐝 — 𝐚𝐧𝐝 𝐰𝐡𝐚𝐭 𝐰𝐞 𝐜𝐚𝐧’𝐭.
Join me at DDD Europe to experience how a shared language can turn communication into computation! In a hands-on lab we’ll create a shared formal language that turns ideas into executable models. 2026.dddeurope.com/program/lets...

Looking forward to joining the DDD Europe 2026 community! Excited to contribute with my hands-on session "Let's create a shared formal language" – it's going to be interactive, collaborative, and hopefully valuable for everyone involved. See you there! -> 2026.dddeurope.com

ROSTAM: Railway-Oriented Security and Threat Abstraction Model Cybersecurity is an increasing issue in the transportation sector and has led to the publication of various standards that give a guideline for risk and threat management. Modern vehicles require a ro...

Threat and security modeling of railway systems in MetaEdit+: ieeexplore.ieee.org/document/112...

DSL of the week: Object Role Modeling, NIAM for data and ontology modeling

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✅ Define your own domain-specific modeling languages
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One license per company: www.metacase.com/store/introd...

They may surely share some common parts, but there are many domains that are clearly unique (see e.g. 100+ public cases at: www.dsmforum.org/cases.html)

🚀 𝐌𝐞𝐭𝐚𝐄𝐝𝐢𝐭+ 5.6 𝐢𝐬 𝐧𝐨𝐰 𝐚𝐯𝐚𝐢𝐥𝐚𝐛𝐥𝐞! Enhanced scalability, performance, and powerful new features for domain-specific modeling and deterministic code generation — see metacase.com/news/ME56.html

DSL of the week: C4 for software architectures (by @simonbrown.je)

DSL of the week: DarTwin for Digital Twins

So happy to see this release! Great features for language engineers & modelers, plus enhanced cloud support

When modeling languages evolve, your models shouldn't break. MetaEdit+ handles co-evolution automatically—updating models & tools as languages change, or highlighting what needs manual review. Your editors stay functional, always. metacase.com/webcasts/coe...

📢 Next week #MODELSconf25 starts with three our contributions:
1️⃣ Co-evolution of metamodels & models:
link.springer.com/article/10.1...
2️⃣ Industry panel on collaboration: 2025.models-conf.com/track/models...
3️⃣ Managing heterogeneous models: Our MoM challenge solution: github.com/mccjpt/Satel...

MODELS 2025 - Panel - MODELS 2025 About Traditionally, MODELS hosts a plenary panel on a trending topic, bringing together experts for an in-depth discussion of a particular topic. Summary Fostering communication and collaboration bet...

“How can we better bridge the gap between academia and industry? Success stories and failures”. MetaCase CTO invited to a panel at ACM/IEEE Conference on Model Driven Engineering Languages and System. Register to join onsite or online. 2025.models-conf.com/track/models...

@metaedit.bsky.social has been very useful for prototyping the language and its concrete syntax. The REPL aspect of the tool is really valuable for designing a metamodel and its concrete syntax based on examples, which co-evolve in a consistent manner.

Our paper for Model Management challenge at ACM Models is accepted!

We show how a Domain-Specific Modeling enables collaborative work, 𝐦𝐢𝐧𝐢𝐦𝐢𝐳𝐞𝐬 𝐭𝐡𝐞 𝐞𝐟𝐟𝐨𝐫𝐭 of modeling, 𝐩𝐫𝐨𝐯𝐢𝐝𝐞𝐬 𝐟𝐚𝐬𝐭 𝐟𝐞𝐞𝐝𝐛𝐚𝐜𝐤, keeps artefacts 𝐜𝐨𝐧𝐬𝐢𝐬𝐭𝐞𝐧𝐭, 𝐭𝐫𝐚𝐜𝐞𝐚𝐛𝐥𝐞 and provides 𝐡𝐚𝐬𝐬𝐥𝐞-𝐟𝐫𝐞𝐞 𝐯𝐞𝐫𝐬𝐢𝐨𝐧𝐢𝐧𝐠.

github.com/mccjpt/Satel...

When we ask feedback from users of 𝐝𝐨𝐦𝐚𝐢𝐧-𝐬𝐩𝐞𝐜𝐢𝐟𝐢𝐜 𝐥𝐚𝐧𝐠𝐮𝐚𝐠𝐞𝐬 the line between 𝘭𝘢𝘯𝘨𝘶𝘢𝘨𝘦 and 𝘵𝘰𝘰𝘭 blurs.

Even the most elegant DSL definition won’t win over users if tooling falls short. A study (lnkd.in/dq3XDEbs) shows this perfectly — what matters is usability, collaboration, integration etc.

DSL of the week: Artefact model for product lines (detailed in doi.org/10.1007/978-...)

It depends on the group as some are active still, but IMHO they are not so effective as earlier - earlier it was even possible to check quickly which your groups had recent discussion.

𝗖𝗿𝗲𝗮𝘁𝗲 𝗬𝗼𝘂𝗿 𝗢𝘄𝗻 𝗟𝗮𝗻𝗴𝘂𝗮𝗴𝗲 𝗳𝗼𝗿 𝗖𝗼𝗱𝗲 & 𝗖𝗼𝗹𝗹𝗮𝗯𝗼𝗿𝗮𝘁𝗶𝗼𝗻!

Want to streamline communication with domain experts & generate code faster? See the slides from our hands-on session at DDD Europe showing how to formalize a ubiquitous language into a domain-specific language: metacase.com/papers/DDD_E...

DSL of the week: Production cell configuration, used for producing code (Python)

Unlock Collaboration with Domain-Specific Languages!
Ever wonder how to bridge the gap between developers and domain experts? Starting today at DDD Europe 2025 a hands-on session … let’s see how it goes. The plan is to create a language that drives communication, code generation and more #dddeurope

Gregor Hope at Donain-Driven Design Europe: "Shift left has become pile up left. Architect cognitive load goes up." @dddeu.bsky.social

I find this critical, as too often people focus only on the initial steps—when in fact, as we know, most of the work happens during use and maintenance.

Evaluate your tool choice before putting it into action: the wrong choice can lead to serious consequences, including users losing their work.

I see it a good trend as it aims to use modeling more extensively: not only for getting better understanding or communication, but also producing the actual code.

Nice surprise: This autumn brings a plethora of events—including conferences and workshops—focused on Domain-Specific Modeling., dsmforum.org/events.html

List, diagram and text representations at once. When having thousands of features it becomes relevant to the representational form on how to split feature variants into easier to manage view (manage = create, read, validate)

DSL of the week: Supporting product line development by producing feature models from domain-specific models (detailed in doi.org/10.1007/978-...)

Do you know how much code is needed to cut grass this summer? Answer: 𝗢𝘃𝗲𝗿 𝟎.𝟓 𝗚𝗕. (The size of the software upgrade: 527MB)

I’m happy with the device, but it keeps me wondering: 𝗶𝘀 𝗮𝗹𝗹 𝘁𝗵𝗶𝘀 𝗿𝗲𝗮𝗹𝗹𝘆 𝗻𝗲𝗲𝗱𝗲𝗱 𝘁𝗼 𝗰𝘂𝘁 𝗴𝗿𝗮𝘀𝘀? Flying to the moon took only 𝟑𝟔𝗞 (but that was 16-bit word length, to be fair).

No reason to stop here. If interested to read about 100+ public cases on domain-specific modeling languages, see www.dsmforum.org/cases.html

DSL of the week: VDSL - low-code for vehicle applications