Blog post export in SIOC

Issue Summary

I've been having a look bit more at the SIOC module with my site and notice that my blog is exported as a forum, there doesn't seem to be anything indicating that it is a blog rather than a discussion forum, although I notice in http://rdfs.org/sioc/types there is a type for a "Weblog". Here is the SIOC output for my blog generated with the latest 5.x-1.x-dev version: http://www.greenhughes.com/sioc/blog/1. I wasn't sure if this was a bug so I have just put the category as "support request". Thanks for your help.