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Tag Unions

Jon Udell is asking for a service to deliver a feed containing the union of tagged items from various services.  I've been doing this for a while (though not for astronomy) using RSSBus.  Here's my script:

<rsb:set attr="feed#1" value="http://del.icio.us/rss/tag/[tag]" />
<rsb:set attr="feed#2" value="http://feeds.technorati.com/tag/[tag]" />
<rsb:set attr="feed#3" value="http://api.flickr.com/services/feeds/photos_public.gne?tags=[tag]&lang=en-us&format=rss_200" />
<rsb:set attr="feed#4" value="http://connotea.org/rss/tag/[tag]" />
<rsb:set attr="feed#5" value="http://wordpress.com/tag/[tag]/feed" />

<rsb:set item="_meta" attr="rss:title" value="Tag Union" />
<rsb:set item="_meta" attr="rss:description" value="A combination of various tagging services" />

<rsb:call op="feedUnion">
    <rsb:push />
</rsb:call>

I saved this as tagUnion.rsb and subscribed to http://localhost/rssbus/tagUnion.rsb?tag=astronomy in FeedDemon, And here's what the resulting feed looks like.  Notice in the screenshot the detail that the RSSBus feedUnion operation gives me.  For Flickr results, just the picture, its description, and the photo owner are included in the description.  But look at the next result, all the rich data that is included in the feed, including the date of the tag, the source(s) where the tag was found (this one was found tagged in both delicious and connotea), and all the rich data from the original source (the taxo: elements).

Print | posted on Thursday, October 11, 2007 3:25 PM

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