Fig. 2: Thoth's advanced book catalogue, drawing on live Thoth metadata.An early implementation of the future Thoth Traffic Light System can be already seen in action: on the "Export Metadata" widget (left) of a given book record, exports that are still unavailable due to missing metadata are being marked with an exclamation mark sign, and a mouse-over will reveal the reason for this.
Steiner et al. (Tue,) studied this question.
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