{'fraction_non_alphanumeric': 0.01987577639751553, 'fraction_numerical': 0.0, 'mean_word_length': 6.132743362831858, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
Research issues in the development of context-aware middleware architectures

Context-aware middleware encompasses uniform abstractions and reliable services for common operations, supports for most of the tasks involved in dealing with context, and thus simplifying the development of context-aware applications. In this paper, we address some key issues of a middleware for context-aware ubiquitous computing, ranging from design considerations of a unified sensing framework, formal modeling and representation of the real world, pluggable reasoning engines for high-level contexts, and context delivery-runtime service composition mechanisms. Our implementation experience indicates that a comprehensive approach throughout the system layers results in a flexible and reusable middleware architecture.