1 HTML Purifier 4.0 is a major feature release focused on configuration
2 It deprecates the $config->set('Ns', 'Directive', $value) syntax for
3 $config->set('Ns.Directive', $value); both syntaxes work but the
4 former will throw errors. There are also some new features: robust
5 support for name/id, configuration inheritance, remove nbsp in
6 the RemoveEmpty autoformatter, userland configuration directives
7 and configuration serialization.