A BlogML tool is actually a converter designed specifically for a blogging engine and is able to export the content of that blog engine into BlogML format or import BlogML content to that blogging engine.
We consider a tool as a BlogML tool under two conditions:
Even though we have the first consideration but there are many import to export tools created as an standalone tool. However, we respect to the work that is done by their developers and support and encourage them to help our users.
Here on BlogML site, we always try to announce new BlogML tools and list them to help our users find best tools easily.