Table 2.

Comparison of used tagging schema with the IOB format, where O represents tokens outside of a sequence and I-Frequency represents tokens which are part of a slot filler sequence of type frequency. In contrast, None represents tokens which are neither start nor end token of a slot filler, start:Frequency marks the start and end:Frequency the end of a frequency slot filler sequence

Tokens	NPH	insulin	once	or	twice	daily	in
IOB	O	O	I-Frequency	I-Frequency	I-Frequency	I-Frequency	O
Used	None	None	start:Frequency	None	None	end:Frequency	None