The parameters that the blog post layout macros accept are not at all documented

The blog post layout macros are very powerful and allow to use powerful displays for the blog.

However, there is no documentation, in the wiki nor on extensions.xwiki.org about what parameters can be passed to the blog post layout macros in the params parameter. Thus, they're quite difficult to use properly (e.g. to obtain the same results as the ones in the screenshots on the documentation page on extensions.xwiki.org).