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This Specification specifies the syntax and an accompanying decoding process that is capable to efficiently represent event sequences in the context of event-based vision applications, relevant in the field of computer vision and image processing. Visual event sequences are generated by event-based (EB) vision sensors. Unlike conventional image sensors, EB vision sensors do not use a common sampling rate?—?known as the frame rate?—?for all pixels, but instead each pixel continuously tracks the amount of incident light and asynchronously samples the signal upon change. This highly efficient way of acquiring sparse data, the high temporal resolution, and the robustness to uncontrolled lighting conditions?—?having high dynamic range?—?are characteristics of the EB sensing process that make EB imaging attractive for numerous applications, like in industrial automation, process monitoring, surveillance, IoT, AR/VR, automotive and mobile environments. This Specification: — specifies decoding processes for converting compressed event sequence data to reconstructed event streams; — specifies the codestream syntax containing the information necessary for interpreting the compressed event sequence data; — provides guidance on encoding processes for converting event streams to compressed event sequence data.