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  1. Proceedings of the 8th annual ACM international workshop on Web information and data management (WIDM '06)
  2. Efficient, automatic web resource harvesting
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The power of structured data on the web
Bridging relational database history and the web: the XML approach
Ranking target objects of navigational queries
Identifying redundant search engines in a very large scale metasearch engine context
An architecture for creating collaborative semantically capable scientific data sharing infrastructures
Efficient evaluation of n-ary conjunctive queries over trees and graphs
Coarse-grained classification of web sites by their structural properties
Pushing task relevant web links down to the desktop
The GEON portal: accelerating knowledge discovery in the geosciences
SRI: exploiting semantic information for effective query routing in a PDMS
Efficient, automatic web resource harvesting
Lazy preservation: reconstructing websites by crawling the crawlers

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Efficient, automatic web resource harvesting

Content Provider ACM Digital Library
Author del Campo, Ignacio Garcia Nelson, Michael L. Smith, Joan A.
Abstract There are two problems associated with conventional web crawling techniques: a crawler cannot know if all resources at a non-trivial web site have been discovered and crawled ("the counting problem") and the human-readable format of the resources are not always suitable for machine processing ("the representation problem"). We introduce an approach that solves these two problems by implementing support for both the Open Archives Initiative Protocol for Metadata Harvesting (OAI-PMH) and MPEG-21 Digital Item Declaration Language (DIDL) into the web server itself. We present the Apache module "mod_oai", which can be used to address the counting problem by listing all valid URIs at a web server and efficiently discovering updates and additions on subsequent crawls. Our experiments indicated comparable performance for initial crawls, and dramatic increases in update speed mod_oaican also be used to address the representation problem by providing "preservation ready" versions of web resources aggregated with their respective forensic metadata in MPEG-21 DIDL format.
Starting Page 43
Ending Page 50
Page Count 8
File Format PDF
ISBN 1595935258
DOI 10.1145/1183550.1183560
Language English
Publisher Association for Computing Machinery (ACM)
Publisher Date 2006-11-10
Publisher Place New York
Access Restriction Subscribed
Subject Keyword Web crawling Oai-pmh Mod_oai
Content Type Text
Resource Type Article
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