定义模型的部分过程是标准化一组通用元数据属性（如标题、说明和作者等），这些属性是所有内容类型中所通用的。

Part of the process of defining the model was to standardize on a set of common metadata properties (such as title, description, authors, and so on) which are common across all content types.

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图4通过部分医学数字图像和通信(Digital Imaging and Communications in Medicine, DICOM)标准，说明了这两种类型的层次结构。

Using part of the DICOM (Digital Imaging and Communications in Medicine) standard, Figure 4 illustrates these two types of hierarchies.

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请按照第2部分中给出的说明来发送不同类型的JMS消息，然后选择Click here to select messages on the reply queue以查看响应消息。

Follow the instructions given in Part 2 to send different kinds of JMS messages, then select Click here to select messages on the reply queue to see the response message.

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