Call for Papers
===============

23rd International Symposium on
Practical Aspects of Declarative Languages (PADL 2021)

https://popl21.sigplan.org/home/PADL-2021

Copenhagen, Denmark
18-19th January 2021
Co-located with POPL 2021

Conference Description
----------------------

The paradigm of declarative languages encompasses several
well-established classes of programming languages, namely: functional,
logic, and constraint programming languages. These languages have
been successfully applied to many different real-world situations,
ranging from database management to active networks to software
engineering to decision support systems. New developments in theory
and implementation have opened up new application areas. At the same
time, applications of declarative languages to novel problems raise
numerous interesting research issues. Well-known questions include
designing for scalability, 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 emphasizing novel applications and
implementation techniques for all forms of declarative programming,
including functional and logic programming, database and constraint
programming, and 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 2021 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, advanced
database languages and contract languages, computational creativas
well as verification and theorem proving methods that rely on
declarative languages.

Submissions
-----------

PADL solicits three kinds of submission, in Springer LNCS format:

* Technical papers (max. 15 pages)

Technical papers must describe original, previously unpublished
research results.

* Application papers (max. 8 pages)

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.

* Extended abstracts (max. 3 pages)

Describing new ideas, a new perspective on already published work, or
work-in-progress that is not yet ready for a full
publication. Extended abstracts will be posted on the symposium
website but will not be published in the formal proceedings.

All page limits exclude references. 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 in which it has previously appeared.

Important dates
---------------

* Deadline: 9th October 2020 (AoE)
* Notification: 6th November 2020
* Symposium: 18-19th January 2021

Submission is via EasyChair: https://easychair.org/conferences/?conf=padl2021

COVID-19
--------

PADL is co-located with POPL, which will take place January 17-22,
2021, as a physical, virtual, or hybrid physical/virtual meeting. We
will be monitoring the Covid-19 situation and will announce a decision
on the nature of the meeting in time which will follow suit with POPL.

Distinguished Papers
--------------------

The authors of a small number of distinguished papers will be invited
to submit a longer version for journal publication after the
symposium. For papers related to logic programming, in the journal
Theory and Practice of Logic Programming (TPLP)
https://www.cambridge.org/core/journals/theory-and-practice-of-logic-programming,
and for papers related to functional programming, in Journal of
Functional Programming (JFP)
https://www.cambridge.org/core/journals/journal-of-functional-programming. The
extended journal submissions should include roughly 30% more content
including, for example, explanations for which there was no space,
illuminating examples and proofs, additional definitions and theorems,
further experimental results, implementational details and feedback
from practical/engineering use, extended discussion of related work
and such like.

These submissions will then be subject to peer review by the journal,
although with the aim of a swifter review process by reusing original
reviews from PADL.

Chairs
------

- Dominic Orchard (University of Kent, UK)
- Jose Morales (IMDEA Software Institute, Spain)

Programme Committee
-------------------

- Mario Alviano (University of Calabria, Italy)
- Nada Amin (Harvard University, USA)
- Edwin Brady (University of St. Andrews, Scotland)
- Joachim Breitner (DFINITY)
- Youyou Cong (Tokyo Institute of Technology)
- Mistral Contrastin (Facebook London)
- Sandra Dylus (University of Kiel, Germany)
- Esra Erdem (Sabanci University, Turkey)
- Martin Gebser (Alpen-Adria-Universität Klagenfurt, Austria)
- Gopal Gupta (U. Dallas, USA)
- Ekaterina Komendantskaya (Heriot-Watt University, Edinburgh, UK)
- Henrik Nilsson (University of Nottingham, UK)
- Enrico Pontelli (New Mexico State University, USA)
- KC Sivaramakrishnan (IIT Madras, India)
- Paul Tarau (University of North Texas, USA)
- Jan Wielemaker (Free University Amsterdam, Netherlands)
- Ningning Xie (University of Hong Kong)
- Neng-Fa Zhou (City University of New York, USA)