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In order to know when to re-check the site for changes, you'ld rather ask its webmaster the hours when she renews the site. You could even suggest her to publish the changes at a newsfeed site (Sourceforge has it) like syndic8 *.
Then to get the notice of those news(changes) you should extract an XML file called RSS or RDF that specifies what articles have changed, or simple that you should re-check the site. There are also PM to extract the RSS info from those files and even download them at a specified frequency:
(*) http://www.syndic8.com/ (**)http://search.cpan.org/search?mode=dist&query=RSS
{\('v')/}
_`(___)' __________________________ In reply to Re: scraping from HTTP page to MySql table
by chanio
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