Table 1. Types of Constraints in OT

Types of Constraints	Meanings
Universality	Constraints are universal.
Violability	Constraints are violable, but violation is minimal.
Ranking	Constraints are ranked on a language-particular basis; the notion of minimal violation is defined in terms of this ranking.
Optimality	An output is ‘optimal’ when it incurs the least serious violations of a set of constraints, taking into account their hierarchical ranking.
Domination	The higher-ranked of a pair of conflicting constraints takes precedence over the lower-ranked one.