Is it possible to create a relation between post and a custom post type, but only if the post is in a specific taxonomy?
Like if you have a post in a category named book review, then you are able to relate that post to writer, but if the post is in a category Colors, then you can relate the post to a post type named paintings.?
The reason I ask is because otherwise the only alternative is to create custom post types for each relationships. And then you can't use the "default" post query for the blog roll, but have to build specialized queries.
I don't think it is possible, because the relationship wizard does not make it possible, but before I start that work of building lots of custom post types, I thought I would ask.