22nd International Symposium on Practical Aspects of Declarative Languages (PADL 2020)https://popl20.sigplan.org/home/PADL-2020,20-21 January 2019, New Orleans, Louisiana, United StatesCo-located with ACM POPL 2020 ( https://popl20.sigplan.org/) ------------------------------

*Declarative programming languages* is an umbrella term for functional, logic, answer-set and constraint-solving programming paradigms, as well as a range of verification and theorem proving methods that rely on such languages. These languages have been successfully applied to many different real-world situations, ranging from data base management and active networks to software engineering and decision support systems.

New developments in theory and implementation have opened up new application areas. At the same time, applications of declarative languages to challenging problems raise new intriguing research questions, such as scalable design and implementation, language extensions for application deployment, and programming environments. Thus, applications drive the progress in the theory and implementation of declarative systems, and benefit from this progress as well.

PADL is a well-established forum for researchers and practitioners to present original work emphasising novel applications and implementation techniques for all forms of declarative programming, including functional and logic programming, data-base and constraint programming, theorem proving. Topics of interest include, but are not limited to:

- Innovative applications of declarative languages - Declarative domain-specific languages and applications - Practical applications of theoretical results - New language developments and their impact on applications - Declarative languages for software engineering - Evaluation of implementation techniques on practical applications - Practical experiences and industrial applications - Novel uses of declarative languages in the classroom - Practical languages and extensions such as probabilistic and reactive languages

*PADL 2020 especially welcomes new ideas and approaches pertaining to applications, design and implementation of declarative languages going beyond the scope of the past PADL symposia, for example database languages and contract languages.* Important Dates and Submission Guidelines:

- Abstracts due: 11 October 2019 - Papers due: 18 October 2019 - Notification to authors: 18 November 2019 - Camera-ready: 29 November 2020

Authors should submit an electronic copy of the full paper in PDF using the Springer LNCS format. The submission will be done through EasyChair conference system: https://easychair.org/conferences/?conf=padl2020

All submissions must be original work written in English. Submissions must be unpublished and not submitted for publication elsewhere. Work that already appeared in unpublished or informally published workshops proceedings may be submitted but the authors should notify the program chair about the place on which it has previously appeared.

PADL 2020 will accept both technical and application papers:

*Technical papers* must describe original, previously unpublished research results. Technical papers must not exceed 15 pages (plus one page of references) in Springer LNCS format.

*Application papers* are a mechanism to present important practical applications of declarative languages that occur in industry or in areas of research other than Computer Science. Application papers are expected to describe complex and/or real-world applications that rely on an innovative use of declarative languages. Application descriptions, engineering solutions and real-world experiences (both positive and negative) are solicited. The limit for application papers is 8 pages in Springer LNCS format but such papers can also point to sites with supplemental information about the application or the system that they describe.

*The proceedings of PADL 2020 will appear in the LNCS series of Springer Verlag: https://www.springer.com/gp/computer-science/lncs https://www.springer.com/gp/computer-science/lncs.* *************************************************************

For further questions, please contact the conference chairs: Ekaterina Komendantskaya <ek19(a)hw.ac.uk> and Annie Liu <liu(a)cs.stonybrook.edu >