研究依存句法的语法约束，找语言真实结构与解析效率的平衡点。
Formal Constraints on Dependency Syntax
- 提出依存句法的语义约束框架，平衡语言真实性和解析效率。
- 指出投影性限制过强，难以描述灵活语序语言现象。
- 为句法解析、语言演化和人类语言处理提供新思路。
依存句法将句子结构表示为由词间有向关系构成的树形结构。尽管广义上任何树形结构都允许，但实际语言中许多结构并不合理或极为罕见。这促使研究者寻找能更好描述真实语言现象的约束条件，以提升句法描述准确性、加快解析速度，并揭示语言演化与人类语言处理机制。投影性是最广泛研究的约束，但已被证明对灵活语序语言而言过于严格。因此，学界提出了多种替代约束，旨在在投影性局限与无限制依存结构的过度宽松之间找到更合理的中间路径。
原文摘要 · Abstract (English)
Dependency syntax represents the structure of a sentence as a tree composed of dependencies, i.e., directed relations between lexical units. While in its more general form any such tree is allowed, in practice many are not plausible or are very infrequent in attested language. This has motivated a search for constraints characterizing subsets of trees that better fit real linguistic phenomena, providing a more accurate linguistic description, faster parsing or insights on language evolution and human processing. Projectivity is the most well-studied such constraint, but it has been shown to be too restrictive to represent some linguistic phenomena, especially in flexible-word-order languages. Thus, a variety of constraints have been proposed to seek a realistic middle ground between the limitations of projectivity and the excessive leniency of unrestricted dependency structures.
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