You don't need to actually include the children; the presence of a children property will indicate to the Tree that the node is expandable and an expansion icon will be included.
事实上，您不需要包含子节点；一个children属性的存在就表明Tree的节点是可展开的，展开图标将被包括在内。
The corresponding mathematical model and DPSO solution algorithm for transmission network expansion planning are developed through the construction of extended node matrix and velocity matrix.
通过构造节点扩展矩阵和速度矩阵，建立了输电网络扩展规划问题的求解模型和DPSO求解算法。
The expansion of the XML is not done because resolution of the namespace for the element cannot occur until the node is placed in the document.
不执行XML扩展的原因在于对元素的命名空间解析只有在将节点放入文档中时才发生。
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