i have written a number of custom parser-functions that return text which itself contains one of my custom tag-extensions... for example,
function myParserFunction_Render( &$parser, $body = '' ) { return "...<myTag>...</myTag>..."; }
using 1.12.0, i now see <myTag>...</myTag> in the generated page; before (with 1.11.0) i saw the results of processing <myTag> in a separate extension.
i realize the parser has undergone some major changes in 1.12.0.... in the past, it seemed, i was able to "pass" information from parser-functions to tag-extensions through this technique. the latter appeared to handled "after" the parser-functions, and were a place where i could lay down things like <img> and <a> tags....