The RSS feed for a branch includes all of the new items postied to a branch, and all of its descendents. Read More

RSS Manual

Blogory is organized as a tree.  You are probably interested in a branch of the tree, rather than the whole tere.  By subscribing to the branch you are interested in, you will be notified of any new content in that node, its children, granchildren, really all of its descendents.   If you want news from two different branches, just subscribe to both of them.  

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