So SGML defined a more abstract view of the file system, called entities.

因此SGML定义了一种更抽象的文件系统视图，称为实体。

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So SGML defined a more abstract view of the file system, called entities.

因此 SGML 定义了一种更抽象的文件系统视图，称为实体。

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Select the WSDL file that contains the abstract service description of the credit card service as described above.

用相同的方法选择包含信用卡服务抽象服务描述的 WSDL 文件。

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