Enumerations

以下为上文引言中所述的核心布局清单。实现方交易平台（exchange）可能不支持所有资产变体，或引入其系统独有的新变体。ENBelow is a list of the core layouts described in the introduction above. An implementing exchange may not support all asset variants or introduce new ones unique to that system.

以下为 IAB 在此描述的核心广告位 ID 清单：http://www.iab.net/media/file/IABNativeAdvertisingPlaybook120413.pdf。In feed 单元本质上是一种布局，已从清单中移除；in feed 单元可通过请求上的 layout 参数识别。实现方交易平台可能不支持所有资产变体，或引入其系统独有的新变体。ENBelow is a list of the core ad unit ids described by IAB here http://www.iab.net/media/file/IABNativeAdvertisingPlaybook120413.pdf. In feed unit is essentially a layout, it has been removed from the list. The in feed units can be identified via the layout parameter on the request. An implementing exchange may not support all asset variants or introduce new ones unique to that system.

以下为规范撰写时原生广告常见资产元素类型清单。本清单非穷尽，旨在由买方与卖方随格式演进而扩展。实现方交易平台可能不支持所有资产变体，或引入其系统独有的新变体。ENBelow is a list of common asset element types of native advertising at the time of writing this spec. This list is non-exhaustive and intended to be extended by the buyers and sellers as the format evolves. An implementing exchange may not support all asset variants or introduce new ones unique to that system.

以下为规范撰写时原生广告常见图像资产元素类型清单。本清单非穷尽，旨在由买方与卖方随格式演进而扩展。实现方交易平台可能不支持所有资产变体，或引入其系统独有的新变体。ENBelow is a list of common image asset element types of native advertising at the time of writing this spec. This list is non-exhaustive and intended to be extended by the buyers and sellers as the format evolves. An implementing exchange may not support all asset variants or introduce new ones unique to that system.