Role and Reference Grammar (RRG) (Foley and Van Valin, 1984; Van Valin and LaPolla, 1997; Van Valin, 2005) is typologically general, semantically-driven syntactic framework. A major focus of RRG is a fine-grained typology of form-to-meaning mapping, emphasizing the syntactic and semantic structure of complex event descriptions. I introduce a constraint-based typed feature structure variant of RRG which exploits RRG's semantically-motivated syntactic backbone: the Layered Structure of the Clause (LSC). Each layer in the LSC is represented as a subtype of sign, and the unique combination of syntactic and semantic properties possessed by each layer is captured by a set of constraints on the appropriate sign subtype. Sentences are incrementally built up from predicates (represented semantically as event frames) to propositions using constructions to pass and combine information through the different layers (and juncture types) in the LSC. An English fragment of this constraint-based RRG is implemented using the Attribute Logic Engine (Carpenter, 1992).
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机译：角色和参考语法（RRG）（Foley和Van Valin，1984； Van Valin和LaPolla，1997； Van Valin，2005）是类型学上一般的，语义驱动的句法框架。 RRG的主要重点是形式到含义映射的细粒度类型学，强调复杂事件描述的句法和语义结构。我介绍了RRG的基于约束的类型化特征结构变体，它利用RRG的语义动机句法主干：子句的分层结构（LSC）。 LSC中的每一层都表示为符号的子类型，并且每一层所拥有的句法和语义属性的唯一组合是通过对适当符号子类型的一组约束来捕获的。句子是从谓词（在语义上表示为事件框架）到命题的逐步构建，其使用的构造是通过LSC中不同层（和接合点类型）传递和组合信息。使用属性逻辑引擎（Carpenter，1992）实现了这种基于约束的RRG的英文片段。
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