btBlog and btBlogEntries

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I wasn't sure whether I should add this to the already long comments attached to the article "Creating a Blog in C5" or start a new discussion:

After downloading and installing the site demo (v5.3.2) and looking under the hood at the database tables I noticed two tables: btBlog and btBlogEntries. I searched for their ADOXMLS definitions by searching the file system under concrete5 for a related db.xml file (using Unix grep -R) but found nothing.

The only block-type that seems to be related is Guestbook, but blocks/guestbook/db.xml defines different tables than btBlog and btBlogEntries. Therefore, where are btBlog and btBlog entries being used?

I, too, want to add blog functionality to a site, but don't want to re-invent the wheel if C5 already implements blogs in some form (even very basic).