  For the past decade, temporal annotation has been sparse: only a small
portion of event pairs in a text was annotated. We present NarrativeTime, the
first timeline-based annotation framework that achieves full coverage of all
possible TLinks. To compare with the previous SOTA in dense temporal
annotation, we perform full re-annotation of TimeBankDense corpus, which shows
comparable agreement with a significant increase in density. We contribute
TimeBankNT corpus (with each text fully annotated by two expert annotators),
extensive annotation guidelines, open-source tools for annotation and
conversion to TimeML format, baseline results, as well as quantitative and
qualitative analysis of inter-annotator agreement.
