RSS feeds are somewhat similar to bookmarks. Unlike bookmarks they don’t require manual attention (that’s the point ) and when you subscribe to dozens (hundreds) of resources it’s easy to end up with plenty of dead feeds. Depending on reader used they might stay low and in no hurry to announce they are no longer working.
Fortunately feeds are merely links to RSS files that can be processed and checked.
Basically you need tool to check list of links and list of links itself. Main problem is making these two lists the same.
Exporting to OPML
<?xml version="1.0" encoding="utf-8"?> <opml version="1.0"> <head> <title>Newsfeeds exported from Opera Mail/9.52 (Win32)</title> </head> <body> <outline text="www.Rarst.net" type="rss" xmlUrl="http://feeds.rarst.net/rarst-posts" title="www.Rarst.net"/> </body> </opml>
Converting to list of links
I am not aware of any dedicated link checkers that take OPML as input. Still it’s text and plain text is good. We need to get list of URLs which is simply one URL per line of text file and which most of link checkers take as input easily.
$opml = FileRead("opera.opml") $pattern='xmlUrl="(.*?)"' $opml=StringRegExp($opml, $pattern, 3) $txt="" For $i=0 To UBound($opml)-1 $txt&=$opml[$i]&@CRLF Next FileWrite("opml.txt",$txt) Exit
Now you only need decent link checker. AM-DeadLink will do just fine.
Note for publishers
It’s common sense to make redirects and such when you are moving web stuff around. Unfortunately most forget to do same with feeds. Don’t rely on default link your CMS provides – you can be on totally different CMS (or domain) in a year. Use FeedBurner or setup gate URL with redirect from the start.