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PhutilMarkupEngine.php
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			<?php

			abstract class PhutilMarkupEngine extends Phobject {

			/**
			* Set a configuration parameter which the engine can read to customize how
			* the text is marked up. This is a generic interface; consult the
			* documentation for specific rules and blocks for what options are available
			* for configuration.
			*
			* @param string $key Key to set in the configuration dictionary.
			* @param string $value Value to set.
			* @return $this
			*/
			abstract public function setConfig($key, $value);

			/**
			* After text has been marked up with @{method:markupText}, you can retrieve
			* any metadata the markup process generated by calling this method. This is
			* a generic interface that allows rules to export extra information about
			* text; consult the documentation for specific rules and blocks to see what
			* metadata may be available in your configuration.
			*
			* @param string $key Key to retrieve from metadata.
			* @param mixed $default (optional) Default value to return if the key is
			* not available.
			* @return mixed Metadata property, or default value.
			*/
			abstract public function getTextMetadata($key, $default = null);

			abstract public function markupText($text);

			}