<uncertain>	(Uncertain value) provides uncertainty value for a feature.
Attributes:
Example	<f name=gender><uncertain>
Tagset	additional tag set for feature structures
Class	singleVal [and indirectly also:] featureVal
Filename	teifs2
Content:	Empty element.
Parents	f fvLib if vAlt vDefault vRange
Children	[none]
Declaration	<!ELEMENT uncertain - O EMPTY > <!ATTLIST uncertain %a.global >
See	16.8