Constraints 1 and 2 stated above are directly related to the Uniqueness Principle of the Dependency Grammar. However, according to some linguistic theories (e.g. Word Grammar), such a principle seems to be too strong, since it does not permit to deal with some specific linguistic phenomena. In order to properly analyse such phenomena, it would be useful to write complex rules without taking into account Uniqueness and then the two constraints stated above. DepPattern allows two special environments within which both constraints are not applied: 'blocs of rule' and operator 'NoUniq'
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