Preface of the 20th International Workshop on OCL and Textual Modeling (OCL'2021) DanielCalegari Instituto de Computación Facultad de Ingeniería Universidad de la República
Uruguay
RobertClarisó Universitat Oberta de Catalunya
Rambla del Poblenou 156 08018 Barcelona Spain
EdwardDWillink Willink Transformations Ltd
Reading England
Preface of the 20th International Workshop on OCL and Textual Modeling (OCL'2021) 1613-0073 8AA5A6C7E1BB00466E0CCB11DA91A4BB GROBID - A machine learning software for extracting information from scholarly documents OCL UML Model-Driven Engineering modeling languages

The Object Constraint Language (OCL) is a popular textual modeling language for describing queries and constraints in object-oriented software development. This paper reports on the 20th International Workshop on OCL and Textual Modeling (OCL'2021), held in collocation with the STAF federated conferences. The workshop reflected on improvements to the OCL language, tools, and applications.

The Object Constraint Language (OCL) is a popular textual notation for describing constraints and queries in object-oriented development. The International Workshop on OCL and Textual Modeling is a yearly forum where the community around OCL gathers to discuss new developments around the OCL language, valuable tools based on OCL, its applications, and other textual modeling languages.

The 20th International Workshop on OCL and Textual Modeling (OCL'2021) was held as a virtual event within the Software Technologies: Applications and Foundations (STAF'2021) federated conferences (https://staf2021.hvl.no/). All the information about the workshop is published on the workshop's website: https://oclworkshop.github.io/2021

The workshop received 8 submissions, of which 7 were accepted for publication. All submitted papers were reviewed by three members from the Program Committee: In addition to the submitted papers, the workshop included a panel with contributions from Dr. Jordi Cabot (ICREA), Dr. Martin Gogolla (Univ. Bremen), and Dr. Antonio Vallecillo (Univ. Málaga). This panel focused on diagnosing the current status of OCL (language, tool ecosystem, community, etc.) using a SWOT matrix (Strengths, Weaknesses, Opportunities, and Threats).

The key conclusions of the panel are presented in the proceedings of this workshop in the paper "A SWOT Analysis of the Object Constraint Language".

Finally, two authors contributed lightning talks during the open session: "Stating the Most General Type, not the Most Specific Type can Make Sense" by Dr. Martin Gogolla and "Normalizing OCL Associations" by Dr. Edward Willink.

•Achim D. Brucker, University of Exeter, UK • Dan Chiorean, Babes-Bolyai University, Romania • Tony Clark, Aston University, UK • Birgit Demuth, Technische Universität Dresden, Germany • Martin Gogolla, University of Bremen, Germany • Frédéric Jouault, ESEO-TECh, France • Sina Madani, University of York, UK • Denis Nikiforov, Advalange, Russia • Xavier Oriol, UPC-Barcelona Tech, Spain OCL'2021: 20th International Workshop on OCL and Textual Modeling, June 25, 2021, Virtual Event Envelope dcalegar@fing.edu.uy (D. Calegari); rclariso@uoc.edu (R. Clarisó); ed at willink.me.uk ( (E. D. Willink) GLOBE https://www.fing.edu.uy/~dcalegar/ (D. Calegari); https://robertclariso.github.io (R. Clarisó) Orcid 0000-0001-9639-0186 (R. Clarisó)
•István Ráth, Budapest University of Technology and Economics, Hungary • Jan Oliver Ringert, University of Leicester, UK • Bernhard Rumpe, RWTH Aachen, Germany • Ernest Teniente, UPC-Barcelona Tech, Spain • Antonio Vallecillo, Universidad de Málaga, Spain • Hao Wu, Maynooth University, Ireland
Acknowledgments

The workshop organizers would like to thank the authors, program committee members, and attendees for their contributions and participation in the workshop. Moreover, we would like to thank the STAF workshop organizers (Ludovico Iovino and Lars Michael Kristensen) and STAF organizers (Adrian Rutle) for their help in the organization of the workshop as a virtual event.