| 摘要 |
In an electronic content store (e.g. for a Web site), objects are organized in a tree structure. Some of the objects are class objects, which define a set of classes for other objects in the store, and at least some of the class objects contain information specifying what classes of child object are permitted for objects of the class defined by this class object. At least some of the class objects own other objects, which describe properties of objects of the class defined by this class object by virtue of their own properties.
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