代码详解—本部分详细解释源代码各部分如何相互配合，以便您可以针对其他类型的元数据和源轻松扩展它。

Code walkthrough-review the code with an explanation of how it all fits together so you can easily extend it for other types of metadata and sources.

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详细内容请参看源代码。

See the source code for more details.

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该示例附带的源代码详细解释了抓取策略。

See the attached source code for complete working example illustrating the fetching strategy.

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