因为类型化表包含其他对象引用的对象，所以每个类型化表都必须像它的第一列那样拥有一个对象标识符。

Because typed tables contain objects that can be referenced by other objects, every typed table must have an object identifier column as its first column.

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结构化数据类型可以用作普通表中某一列的类型(清单1和清单2)，也可以用作整个表(或视图)的类型，或者用作另一个结构化类型的属性(清单3)。

A structured data type can be used as the type for a column in a regular table (Listings 1 and 2), the type for an entire table (or view), or as an attribute of another structured type (Listing 3).

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接下来根(反)序列化器将在类型映射注册表中查询下一个要调用的常规(反)序列化器。

The root (DE) serializer in turn will query the type mapping registry for the next normal (DE) serializer to be called.

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