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<?php

/**
 * Abstract base node class that all others inherit from.
 *
 * Why do we not use the DOM extension?  (1) It is not always available,
 * (2) it has funny constraints on the data it can represent,
 * whereas we want a maximally flexible representation, and (3) its
 * interface is a bit cumbersome.
 */
abstract class HTMLPurifier_Node
{
    /**
     * Line number of the start token in the source document
     * @type int
     */
    public $line;

    /**
     * Column number of the start token in the source document. Null if unknown.
     * @type int
     */
    public $col;

    /**
     * Lookup array of processing that this token is exempt from.
     * Currently, valid values are "ValidateAttributes".
     * @type array
     */
    public $armor = array();

    /**
     * When true, this node should be ignored as non-existent.
     *
     * Who is responsible for ignoring dead nodes?  FixNesting is
     * responsible for removing them before passing on to child
     * validators.
     */
    public $dead = false;

    /**
     * Returns a pair of start and end tokens, where the end token
     * is null if it is not necessary. Does not include children.
     * @type array
     */
    abstract public function toTokenPair();
}

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