Jakob Voss combines OpenSearch and unAPI to enrich catalogues. <a href="/category/issue-number/issue57">issue57</a> October 2008 <a href="/category/article-type/feature-article">feature article</a> <a href="/taxonomy/term/1006/author-info">jakob voss</a> Ed Summers describes Net::OAI::Harvester, the Perl package for easily interacting with OAI-PMH repositories as a metadata harvester. Ed provides examples of how to use Net::OAI::Harvester to write short programs which execute each of the 6 OAI-PMH verbs. <a href="/issue38">issue38</a> January 2004 <a href="/category/article-type/feature-article">feature article</a> <a href="/taxonomy/term/746/author-info">ed summers</a> Ian Peacock explains mod_perl technology for supercharging the Apache Server. <a href="/issue21">issue21</a> September 1999 <a href="/category/article-type/tooled">tooled up</a> <a href="/taxonomy/term/490/author-info">ian peacock</a> Ian Peacock and Andy Powell describe a proposed algorithm for calculating a checksum for Web pages. <a href="/issue17">issue17</a> September 1998 <a href="/category/article-type/regular-column">regular column</a> <a href="/taxonomy/term/354/author-info">andy powell</a>, <a href="/taxonomy/term/490/author-info">ian peacock</a>