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-
-Configuration Backwards-Compatibility Breaks
-
-In version 4.0.0, the configuration subsystem (composed of the outwards
-facing Config class, as well as the ConfigSchema and ConfigSchema_Interchange
-subsystems), was significantly revamped to make use of property lists.
-While most of the changes are internal, some internal APIs were changed for the
-sake of clarity. HTMLPurifier_Config was kept completely backwards compatible,
-although some of the functions were retrofitted with an unambiguous alternate
-syntax. Both of these changes are discussed in this document.
-
-
-
-1. Outwards Facing Changes
---------------------------------------------------------------------------------
-
-The HTMLPurifier_Config class now takes an alternate syntax. The general rule
-is:
-
-    If you passed $namespace, $directive, pass "$namespace.$directive"
-    instead.
-
-An example:
-
-    $config->set('HTML', 'Allowed', 'p');
-
-becomes:
-
-    $config->set('HTML.Allowed', 'p');
-
-New configuration options may have more than one namespace, they might
-look something like %Filter.YouTube.Blacklist. While you could technically
-set it with ('HTML', 'YouTube.Blacklist'), the logical extension
-('HTML', 'YouTube', 'Blacklist') does not work.
-
-The old API will still work, but will emit E_USER_NOTICEs.
-
-
-
-2. Internal API Changes
---------------------------------------------------------------------------------
-
-Some overarching notes: we've completely eliminated the notion of namespace;
-it's now an informal construct for organizing related configuration directives.
-
-Also, the validation routines for keys (formerly "$namespace.$directive")
-have been completely relaxed. I don't think it really should be necessary.
-
-2.1 HTMLPurifier_ConfigSchema
-
-First off, if you're interfacing with this class, you really shouldn't.
-HTMLPurifier_ConfigSchema_Builder_ConfigSchema is really the only class that
-should ever be creating HTMLPurifier_ConfigSchema, and HTMLPurifier_Config the
-only class that should be reading it.
-
-All namespace related methods were removed; they are completely unnecessary
-now. Any $namespace, $name arguments must be replaced with $key (where
-$key == "$namespace.$name"), including for addAlias().
-
-The $info and $defaults member variables are no longer indexed as
-[$namespace][$name]; they are now indexed as ["$namespace.$name"].
-
-All deprecated methods were finally removed, after having yelled at you as
-an E_USER_NOTICE for a while now.
-
-2.2 HTMLPurifier_ConfigSchema_Interchange
-
-Member variable $namespaces was removed.
-
-2.3 HTMLPurifier_ConfigSchema_Interchange_Id
-
-Member variable $namespace and $directive removed; member variable $key added.
-Any method that took $namespace, $directive now takes $key.
-
-2.4 HTMLPurifier_ConfigSchema_Interchange_Namespace
-
-Removed.
-
-    vim: et sw=4 sts=4