Enhancing Semistructured Data Mediators with Document Type Definitions

3/29/99


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Table of Contents

Enhancing Semistructured Data Mediators with Document Type Definitions

Web as a Distributed DB with a Semistructured Data Model(XML)

Create XML Docs / Virtual Sites Using View Definitions

Schema Inference

Benefit: Query Formulation

Document Type Definitions (DTDs)

DTDs are a loose form of schema

And multiple DTDs may satisfy the view

Precise View DTDs are Sound and Tight - at least Tightest

Structural Classes Group Documents with Same Structure

Revisited Definition of Tightness

Specialized DTDs Resolve the Inherent Non-Tightness Problems of DTDs

Schema Inference Algorithm

Result List Type Inference (Step 1)

Result List Type Inference (Step 2)

Result List Type Inference (Step 3)

Result List Type Inference (Step 4)

Related Work

Future Work

Author: Yannis Papakonstantinou