Excerpt from:  Topic Cloud FAQ
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Can I get an RSS feed from a topic cloud?

Yes
It is possible to create custom feeds based on specific keywords (or tags) used in your blog posts.  Contact MyST Technology Partners to obtain more information about this powerful configuration.
Topic Tags:  
Syndication OptionsRSS (Rich Site Summary) Feed Atom Feed OPML (Outline Processor Language) Feed MYST-ML (MyST Markup Language) Content Feed MS-Office Smart Tag Subscription