说明：  针对 XML 数据半结构化的特点及概率查询理论，结合蚁群算法，提出添加杂交算子和更新信息素的方法，该方法不仅能动态选 择数据查询方向，而且能避免无效查询，扩大数据查询范围，提高收缩效率。模拟测试证明了该方法能优化XML查询。
(Semi-structured XML data for the characteristics and the probability of query theory, combined with the ant colony algorithm, crossover operator and proposed to add pheromone update method can not only dynamically select the data direction query, but also to avoid invalid query, the query to expand the scope of data improve the efficiency of contraction. Simulation tests proved that the method can optimize XML queries.)