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* Supertype for classes that define a strategy for modifying/purifying tokens.
* While HTMLPurifier's core purpose is fixing HTML into something proper,
* strategies provide plug points for extra configuration or even extra
* features, such as custom tags, custom parsing of text, etc.
abstract class HTMLPurifier_Strategy
* Executes the strategy on the tokens.
* @param $tokens Array of HTMLPurifier_Token objects to be operated on.
* @param $config Configuration options
* @returns Processed array of token objects.
abstract public function execute($tokens, $config, $context);
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