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HCVS 2020: Call For Papers7th Workshop on Horn Clauses for Verification and Synthesis (HCVS)Co-located with ETAPS 2020Sunday 26 April 2020 - Dublin, Ireland https://www.sci.unich.it/hcvs20/Many Program Verification and Synthesis problems of interest can bemodeled directly using Horn clauses, and many recent advances in theConstraint/Logic Programming, Verification, and Automated Deductioncommunities have centered around efficiently solving problemspresented as Horn clauses.This workshop aims to bring together researchers working in thecommunities of Constraint/Logic Programming (e.g., ICLP and CP),Program Verification (e.g., CAV, TACAS, and VMCAI), and AutomatedDeduction (e.g., CADE), on the topic of Horn clause based analysis,verification and synthesis.Horn clauses have been advocated by these communities at differenttimes and from different perspectives, and this workshop is organizedto stimulate interaction and a fruitful exchange and integrationof experiences.The workshop follows six previous meetings: HCVS 2019 in Prague, Czech Republic (ETAPS 2019), HCVS 2018 in Oxford, UK (CAV, ICLP and IJCAR at FLoC 2018), HCVS 2017 in Gothenburg, Sweden (CADE), HCVS 2016 in Eindhoven, The Netherlands (ETAPS), HCVS 2015 in San Francisco, CA, USA (CAV), and HCVS 2014 in Vienna, Austria (VSL). Aims and Scope--------------Topics of interest include but are not limited to the use of Hornclauses, constraints, and related formalisms in the following areas:- Analysis and verification of programs and systems of various kinds(e.g., imperative, object-oriented, functional, logic, higher-order,concurrent)- Program synthesis- Program testing- Program transformation- Constraint solving- Type systems- Case studies and tools- Challenging problemsWe solicit regular papers describing theory and implementation ofHorn-clause-based analysis and tool descriptions. We also solicitextended abstracts describing work-in-progress, as well aspresentations covering previously published results that are ofinterest to the workshop.Important dates---------------- Paper submission: 26th February 2020- Paper notification: 25th March 2020- Camera-ready: 1st April 2020- Workshop: 26th April 2020Submission----------Submission has to be done in one of the following formats:- Regular papers (up to 12 pages plus bibliography in EPTCS format), whichshould present previously unpublished work (completed or in progress),including descriptions of research, tools, and applications.- Tool papers (up to 4 pages plus bibliography in EPTCS format), including thepapers written by the CHC-COMP participants, which can outline the theoreticalframework, the architecture, the usage, and experiments of the tool.- Extended abstracts (up to 3 pages in EPTCS format), which describe workin progress or aim to initiate discussions.- Presentation-only papers, i.e., papers already submitted or presented ata conference or another workshop. Such papers can be submitted in any format,and will not be included in the workshop post-proceedings.All submitted papers will be reviewed by the program committee and will beselected for inclusion in accordance with the referee reports.Authors of accepted papers are required to ensure that at least one of themwill be present at the workshop. Papers must be submitted through theEasyChair system using the web page:https://easychair.org/conferences/?conf=hcvs2020