Each class loader also keeps a reference to a parent class loader, defining a tree of class loaders with the bootstrap loader at the root.

每个类装入器还保留对父类装入器的引用，这样就定义了类装入器树，树根为引导程序装入器。

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For example, if an element child inherits from element parent, the schema tree for child will include a group for parent that is based on its type.

例如，如果一个子元素继承自父元素，子元素的架构树将包含一个基于其类型的父元素组。

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Any row in the parent table can be selected to expand the tree to the location of the selected parent object.

可以选择父表中的任何行，将树扩展到所选父对象的位置。

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