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。
2
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。
3
I've structured this article as a catalog of patterns for testing aspect-oriented code.