The XML Wrapper is a new feature of the federated database capabilities of DB2/UDB v8. It enables users and applications to issue SQL queries against XML data from a variety of sources, including files and web services. The XML Wrapper assumes hierarchical XML documents modeled as families of virtual relational tables in a federated schema, which can then be queried to extract information from ...

Several techniques have been recently proposed to automatically generate Web wrappers, i.e., programs that extract data from HTML pages, and transform them into a more structured format, typically in XML. These techniques automatically induce a wrapper from a set of sample pages that share a common HTML template. An open issue, however, is how to collect suitable classes of sample pages to feed...

Emerging distributed technologies aim to provide simple and powerful tools for web services design and implementation. Main vendors provide modern frameworks so that a good coordination between web interfaces and object oriented paradigms can be supported. These frameworks aim to divide a web application in different logical tiers and they describe these tiers by a object oriented architecture....

We demonstrate a system to automatically grab data from data intensive web sites. The system first infers a model that describes at the intensional level the web site as a collection of classes; each class represents a set of structurally homogeneous pages, and it is associated with a small set of representative pages. Based on the model a library of wrappers, one per class, is then inferred, w...

Despite its rising popularity, using and managing Linked Data remains a challenge for developers of mainstream web and mobile applications. In this demo we present "LDtogo", a framework that makes it easy for application administrators to integrate and maintain Linked Data when building new applications or when re-using existing ones. LDtogo does this by 1) supporting data processing by means o...

This paper presents a novel method for extracting information from collections of Web pages across different sites. Our method uses a standard wrapper induction algorithm and exploits named entity information. We introduce the idea of post-processing the extraction results for resolving ambiguous facts and improve the overall extraction performance. Postprocessing involves the exploitation of t...

Reengineering existing (large-scale) applications to the web is a complex and highly challenging task. This is due to a variety of mostly demanding requirements for interactive web applications. Usually high performance is required, old interfaces still have to be supported, high availability requirements are usual, information has to be provided to multiple channels and in different formats, p...

A critical problem in developing information agents for the Web is accessing data that is formatted for human use. We have developed a set of tools for extracting data from web sites and transforming it into a structured data format, such as XML. The resulting data can then be used to build new applications without having to deal with unstructured data. The advantages of our wrapping technology...

Modern agent and mediator systems communicate to a multitude of Web information providers to better satisfy user requests. They use wrappers to extract relevant information from HTML responses and to annotate it with userdefined labels. A number of approaches exploit the methods of machine learning to induce instances of certain wrapper classes, by assuming the tabular structure of HTML respons...