Message 140783 - Python tracker

Having them in different mappings would be good, but I expect that for most real world application a single mappings that includes them all is the way to go.  If I'm parsing a supposedly HTML page that contains an ' I'd rather have it converted even if it's not an HTML entity.
If the set of entities supported by HTML5 is a superset of the HTML4 and XHTML ones, than we might just use that (I haven't checked though).