EventKG: A Multilingual Event-Centric Temporal Knowledge Graph
Table 4: Number of events and relations in eventKG-g:event_kg.
['[EMPTY]', '[BOLD] #Events', '[BOLD] Known time', '[BOLD] Known location']
In EventKG V1.1, we extracted event representations and relations in five languages from the latest available versions of each reference source as of 12/2017. Overall, this version provides information for over 690 thousand events and over 2.3 million temporal relations. Nearly half of the events (46.75%) originate from the existing KGs; the other half (53.25%) is extracted from semi-structured sources. The data quality in the individual named graphs directly corresponds to the quality of the reference sources. In eventKG-g:event_kg, the majority of the events (76.21%) possess a known start or end time. Locations are provided for 12.21% of the events. The coverage of locations can be further increased in the future work, e.g. using NLP techniques to extract locations from the event descriptions. Along with over 2.3 million temporal relations, EventKG V1.1 includes relations between events and entities for which the time is not available. This results in overall over 88 million relations. Approximately half of these relations possess interlinking information.