Toolkits for Generating Wrappers
نویسندگان
چکیده
Various web applications in e-business, such as online price comparisons, competition monitoring and personalised newsletters require retrieval of distributed information from the Internet. This paper examines the suitability of software toolkits for the extraction of data from web sites. The term wrapper is defined and an overview of presently available toolkits for generating wrappers is provided. In order to give a better insight into the workings of such toolkits, a detailed analysis of the non-commercial software program LAPIS is presented. An example application using this toolkit demonstrates how acceptable results can be achieved with relative ease. The functionality of the program is compared with the functionality of the commercial toolkit RoboMaker and the differences are highlighted. With the aim of providing improved ease-of-use and faster wrapper generation in mind, possible areas for further development of toolkits for automated web data extraction are discussed.
منابع مشابه
Object-Oriented Mediator Queries to Internet Search Engines
A system is described where multiple Internet search engines (ISEs), e.g. Alta Vista or Google, are accessed from an Object-Relational mediator database system. The system makes it possible to express object-oriented (OO) queries to different ISEs in terms of a high level OO schema, the ISE schema. The OO ISE schema combined with the mediator database system provides a natural and extensible me...
متن کاملA PUT-Based Approach to Automatically Extracting Quantities and Generating Final Answers for Numerical Attributes
Automatically extracting quantities and generating final answers for numerical attributes is very useful in many occasions, including question answering, image processing, human-computer interaction, etc. A common approach is to learn linguistics templates or wrappers and employ some algorithm or model to generate a final answer. However, building linguistics templates or wrappers is a tough ta...
متن کاملRubabel: wrapping open Babel with Ruby
BACKGROUND The number and diversity of wrappers for chemoinformatic toolkits suggests the diverse needs of the chemoinformatic community. While existing chemoinformatics libraries provide a broad range of utilities, many chemoinformaticians find compiled language libraries intimidating, time-consuming, arcane, and verbose. Although high-level language wrappers have been implemented, more can be...
متن کاملAn Advanced Communication Toolkit for Implementing the Broker Pattern
The Broker pattern is a powerful solution when building middleware communication systems. Existing toolkits, such as BAST, GTS, and ACE, although useful, are insufficient to implement the Broker pattern architecture. These systems concentrate on wrappers for communication protocols, and on implementing auxiliary communication patterns, but address only some aspects of object communication. In t...
متن کاملAutoWrapper: automatic wrapper generation for multiple online services
A crucial challenge for information extraction from the WWW is to generate wrappers, which are information extraction patterns or rules, which apply to numerous Web sites with great diversity in both format and content. Generating wrappers manually is tedious, time consuming and errorprone. Recent research has successfully adapted machine learning technology to generate wrappers for semi-struct...
متن کامل