Developments in Language Theory

This book constitutes the refereed proceedings of the 30th International Conference on Developments in Language Theory, DLT 2026, held in Rouen, France, during June 30 – July 3, 2026. The 22 full papers and 3 invited papers included in this book were carefully reviewed and selected from 49 submissions. They present current developments in the field of formal language theory and its applications.