Figure 2.

Table storage using the DynamicTable layout. (A) The table to store contains three columns: trial_id (an integer), start_time (a float) and tags (zero or more strings). Trial_id 1 (first row) has three tags, trial_id 2 has no tags, and the other two trials each have one tag. (B) Storage in NWB format using the DynamicTable layout. The tags column is stored using two datasets: tag_index and tags. The tags dataset contains all the tags from all trials concatenated. The trial_id and start_time and tags_index are store in separate datasets with their elements aligned according to each row. (This illustrates aligned datasets). The tags_index array indicates which tags (elements of the tags array) are in each row of tags column of the table. Each element of tags_index is the index just beyond the last value included for that row. (This illustrates the index array).