Tabular Model Definition Language (TMDL) Guide

Tabular Model Definition Language TMDL folder structure diagram showing per-object files for Power BI semantic model governance - Numlytics

Tabular Model Definition Language (TMDL) has become the default format in Power BI, offering significant advantages over the legacy TMSL format. By storing model components in individual files, TMDL enhances version control, supports concurrent development, and facilitates code reviews. This transition improves governance, reduces deployment risks, and increases analytical efficiency for businesses.