For example, a catalog service may return general product details as a part of the structured message, but return images as attachments to the message.

例如，一个目录服务可能返回概括的细节作为一个结构化的消息的一部分，但是返回图像作为该消息的附件。

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The catalog also has ever-increasing amounts of harvestable, structured, semantic metadata about its concepts.

这个目录还有不断增长的可收割、结构化的语义元数据，用来描述这些概念。

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I've structured this article as a catalog of patterns for testing aspect-oriented code.

我将本文写成测试面向方面代码的模式的编目。

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