Deciding Equivalence of Top-Down XML Transformations in Polynomial Time

نویسندگان

  • Sebastian Maneth
  • Helmut Seidl
چکیده

Many useful XML transformations can be formulated through deterministic top-down tree transducers. A canonical form for such transducers is presented which allows to decide equivalence of their induced transformations in polynomial time. If the transducer is total, the canonical form can be obtained in polynomial time as well.

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Deciding Equivalence of Linear Tree-to-Word Transducers in Polynomial Time

We show that the equivalence of deterministic linear top-down treeto-word transducers is decidable in polynomial time. Linear tree-to-word transducers are non-copying but not necessarily order-preserving and can be used to express XML and other document transformations. The result is based on a partial normal form that provides a basic characterization of the languages produced by linear tree-t...

متن کامل

Exact XML Type Checking in Polynomial Time

Stay macro tree transducers (smtts) are an expressive formalism for reasoning about XSLT-like document transformations. Here, we consider the exact type checking problem for smtts. While the problem is decidable, the involved technique of inverse type inference is known to have exponential worst-case complexity (already for top-down transformations without parameters). We present a new adaptive...

متن کامل

Determinacy and Rewriting of Top-Down and MSO Tree Transformations

A query is determined by a view, if the result to the query can be reconstructed from the result of the view. We consider the problem of deciding for two given tree transformations, whether one is determined by the other. If the view transformation is induced by a tree transducer that may copy, then determinacy is undecidable, even for identity queries. For a large class of non-copying views, n...

متن کامل

Normalization and Learning of Transducers on Trees and Words. (Normalisation et Apprentissage de Transducteurs d'Arbres et de Mots)

Since the arrival of the Web, various kinds of semi-structured data formats were introduced in the areas of computer science and technology relevant for the Web, such as document processing, database management, knowledge representation, and information exchange. The most recent technologies for processing semi-structured data rely on the formats Json and Rdf. The main questions there are how t...

متن کامل

A Polynomial-time Algorithm for Deciding Equivalence of Normed Context-free Processes

A polynomial-time procedure is presented for deciding bisimilarity of normed context-free processes. It follows as a corollary that language equivalence of simple context-free grammars is decidable in polynomial time.

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

عنوان ژورنال:

دوره   شماره 

صفحات  -

تاریخ انتشار 2007