The Synt parser

The Synt is a tool for automatic syntactic analysis for Czech and Slovak language. Synt parser is based on a context-free backbone enhanced with contextual actions and performs a stochastic agenda-based head-driven chart analysis. The input for Synt parser is morphologically annotated sentence in vertical form. The output of Synt parser are: a phrase-structure tree, a dependency graph and a set of syntactic structures.

Synt grammar specification

In synt parser we use meta-grammar concept with tree grammar forms. Synt parser is based on a context-free backbone enhanced with contextual actions and performs a stochastic agenda-based head-driven chart analysis.

Synt meta-grammar
In synt parser we use tree grammar forms denotated as G1, G2 and G3. The G1 meta-grammar form is designed for human experts. The meta-grammar form contains high-level generative constructs that reflect natural language phenomena (like eword order constraints). The meta-grammar form is base for G2 grammar form where the meta-grammar rules are expanded.
The G2 grammar form consists of context free rules with feature agreement tests and other contextual actions.
The G3 grammar form consist of standard rules of the expanded grammar with the actions remaining to garantee the contextual requirements.

The G1 meta-grammar form
The meta-grammar consists of global order constraints that provide succession of given terminals. Meta-grammar contains special flags that impose partial restrictions to given non-terminals and terminals on the right side of the rule. In grammar rules are used different arrow marks (->, -->, ==>, ===>), that specify rule type. The meaning of arrow form is: "the thicker and longer the arrow the more actions are able to be done in rule translation". The '->' arrow de-notates an ordinary context free grammar transcription and '===>' inserts possible integer_segment between right hand side constituents, checks the correct order of enclitics and supplies several forms of rule to make the verb phrase into a full sentence.