  This study analyses Turkish syntax from an informational point of view. Sign
based linguistic representation and principles of HPSG (Head-driven Phrase
Structure Grammar) theory are adapted to Turkish. The basic informational
elements are nested and inherently sorted feature structures called signs.
  In the implementation, logic programming tool ALE (Attribute Logic Engine)
which is primarily designed for implementing HPSG grammars is used. A type and
structure hierarchy of Turkish language is designed. Syntactic phenomena such a
s subcategorization, relative clauses, constituent order variation, adjuncts,
nomina l predicates and complement-modifier relations in Turkish are analyzed.
A parser is designed and implemented in ALE.
