This book contains the revised and extended versions of selected papers from the 9th International Conference, ICAART 2017, held in Porto, Portugal, in February 24-26, 2017.The 11 full papers were carefully reviewed and selected from 158 initial submissions.

A Description Logic Based Knowledge Representation Model for Concept Understanding.- Reasoning for Autonomous Agents in Dynamic Domains: Towards Automatic Satisfaction of the Module Property.- Chest X-Ray Image Analysis - A Vision of Logic Programming.- Text Classification and Transfer Learning based on Character-level Deep Convolutional Neural Networks.- A Hierarchical Playscript Representation of Distributed Words for Effective Semantic Clustering and Search.- Data Harvesting and Event Detection from Czech Twitter.- Variants of Independence Detection in SAT-based Optimal Multi-Agent Path Finding.- ε-Strong Privacy Preserving Multi-agent Planning.- A Quantitative Assessment of the JADEL Programming Language.- Analogical Reasoning in Clinical Practice with Description Logic ELH.- Advanced User Interfaces for Semantic Annotation of Complex Relations in Text.