树构造器创建源 XML 文档的树表示法。
The tree constructor creates a tree representation of a source XML document.
如果用户决定这样做，当树构造完成时可以再回来访问这些部分。
If the user chooses to do so, he can cycle back and access those parts again as if the tree was completely built.
详细介绍了适合流媒体直播的应用层组播树构造算法，并分析了其优缺点。
Algorithm for construct ALM spanning tree which is applied in stream media living broadcast is introduced.
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