But maps lack some of the features expected of structured data: they have no real "type" (without added metadata) and, unlike classes, they can't be extended with new behavior.

但是映射缺乏一些结构化数据的预期功能：它们没有真实的“类型”(在不添加元数据的情况下)，不像类那样，它们不能通过新的行为扩展。

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A Guardian technology director said: "We will have final numbers of real users and the type of data in the next few days, once we strip out duplicates, false emails and so on."

《卫报》技术总监说：“过几天，我们剔除重复或虚假的邮件地址后，就会得到真正用户的最终数量和数据类型。”

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In a real implementation, each event would include some type of patient identifier that would be used to find the doctor's E-mail address from an external data source.

在一个真实的实现中，每个事件都将包含某种类型的病人标识符，用于从一个外部数据源查找医生的电子邮件地址。

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When you pair this type of qualitative insight, at scale, with the powerful real-time data that we all expect from the Nielsen-Twitter partnership, you unlock endless possibilities for more relevant and more timely consumer engagement.

FORBES: Nielsen and Twitter: A Game-Changing Partnership That Will Shape the TV Ecosystem