PDF 1.5以后，间接对象可以放在对象流(object streams)中，参看2.4.6节。引用它们的方法完全相同，但是在对象流的定义不用关键字obj和endobj。
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Although this action has only a single object, it is valid to embed multiple objects in an Activity Streams entry-for example, to modify Listing 3 to represent the action Ben posted two blog entries.
虽然这个动作只有一个对象，但是可以在Activity Streams项中嵌入多个对象—例如，修改清单3以表示动作Ben posted two blog entries。
Here you'll create a basic PHP encoder object that represents an Activity Streams feed when you convert it to a string (for example, by using the PHP echo statement with it).
这里您将创建一个基本的PHP编码器对象，当您将它转换成一个字符串时(例如，通过使用PHP echo语句进行处理)，它会表示一个Activity Streams订阅源。
Video semantic information is referred to the information about the objects in video streams, including object shape, spatial relation between objects, and events related to objects, etc.
视频语义信息是指描述视频中的物体形状、物体之间空间关系以及物体的事件等内容的信息。
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