{'fraction_non_alphanumeric': 0.011363636363636364, 'fraction_numerical': 0.0, 'mean_word_length': 5.0256410256410255, '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}}
Temporal Extent for Global Change Research Databases

We propose temporal extent, a concept that can be used to produce summary or abstracted information about the values of temporal attributes in a database relation or class of objects. In its simplest form, the temporal extent is a one-dimensional interval representing the minimum and maximum time points of the instances in a class. More generally, a set of temporal intervals are used to capture the temporal coverage of a set of temporal objects or class. The summary provides information about the class in a compact form that can be used concurrently with statistical abstraction mechanisms for approximate query answering and for fast browsing.