Guest editorial for the theme section on modeling language engineering.

Low-code software development is heavily reliant on software reuse. The paper I Safe reuse in modeling language engineering using model subtyping with OCL constraints i by Artur Boronat focuses on low-code software development using Domain-Specific Languages (DSL) and Model-Driven Engineering (MDE). Software-intensive systems are becoming more complex, driven by the need to integrate across multiple aspects. [Extracted from the article]