1<?php 2 3namespace dokuwiki\Search\Query; 4 5/** 6 * A typed entry on the QueryEvaluator's RPN evaluation stack 7 * 8 * Stack entries represent intermediate results during query evaluation. 9 * Implementations are PageSet (concrete results), NamespacePredicate 10 * (a filter), and NegatedEntry (logical NOT wrapper). 11 */ 12interface StackEntry 13{ 14} 15