Enumerations
Native 1.0 规范共定义 4 张枚举表（31 个取值）；各表 500+ 为交易所保留段。
Below 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.
| 1 | Content Wall |
| 2 | App Wall |
| 3 | News Feed |
| 4 | Chat List |
| 5 | Carousel |
| 6 | Content Stream |
| 7 | Grid adjoining the content |
| 500+ | Reserved for Exchange specific layouts. |
Below 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.
| 1 | Paid Search Units |
| 2 | Recommendation Widgets |
| 3 | Promoted Listings |
| 4 | In-Ad (IAB Standard) with Native Element Units |
| 5 | Custom /'Can't Be Contained' |
| 500+ | Reserved for Exchange specific formats. |
Below 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.
| 1 | sponsored | Sponsored By message where response should contain the brand name of the sponsor. | text |
| 2 | desc | Descriptive text associated with the product or service being advertised. | text |
| 3 | rating | Rating of the product being offered to the user. For example an app's rating in an app store from 0-5. | number formatted as string |
| 4 | likes | Number of social ratings or 'likes' of the product being offered to the user. | number formatted as string |
| 5 | downloads | Number downloads/installs of this product | number formatted as string |
| 6 | price | Price for product / app / in-app purchase. Value should include currency symbol in localised format. | number formatted as string |
| 7 | saleprice | Sale price that can be used together with price to indicate a discounted price compared to a regular price. Value should include currency symbol in localised format. | number formatted as string |
| 8 | phone | Phone number | formatted string |
| 9 | address | Address | text |
| 10 | desc2 | Additional descriptive text associated with the product or service being advertised | text |
| 11 | displayurl | Display URL for the text ad | text |
| 12 | ctatext | CTA description - descriptive text describing a 'call to action' button for the destination URL. | text |
| 500+ | XXX | Reserved for Exchange specific usage numbered above 500 | Unknown |
Below 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.
| 1 | Icon | Icon image |
| 2 | Logo | Logo image for the brand/app. |
| 3 | Main | Large image preview for the ad |
| 500+ | XXX | Reserved for Exchange specific usage numbered above 500 |