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这是JSON格式的原子更新的主体。我复制从hereXML格式的solr原子更新
{"id":"mydoc","price":{"set":99},"popularity":{"inc":20},"categories":{"add":["toys","games"]}, "promo_ids":{"remove":"a123x"}, "tags":{"remove":["free_to_try","on_sale"]}}
如何编写XML格式的相同的代码?