-- <?=$!variablename?> will output the variable "variablename" but not HTML-escaped
-- <?=s,$!variablename,My %s text?> will insert the variable "variablename" into the translated text but not HTML-escaped
-- <?=s,"some data",My %s text?> will insert "some data" into the translated text
-- <?=s,!"some data",My %s text?> will insert "some data" into the translated text literally (not HTML-escaped)
-
-- <? if($variable) { ?>