This sets the export of POSTS. POSTS are sorted by $blogDate, but before this they are sorted by $blogReady. As a result, your POSTS are arranged into two tiers, with the ready set on top. The sets are visually distinguished by color. Non-ready POSTS are given the _skip color.

$AgentQuery

(descendedFrom("BlogPOSTS") & $OutlineDepth(original)=4) 

$AgentAction

if($StartDate){$blogDate=$StartDate}else{$blogDate=$Created}; if($blogReady){$Color=;$blogDisqus=1}else{$HTMLDontExport=;$Color="_skip";$blogDisqus=;};