# 概述

Contract Open Standard是Relation Protocol约定的智能合约标准，标准包含一下两部分约定：

* 合约需要符合[Open Standard API](/protocol/protocol-zh/open-standard-api/introduction.md)中所定义的数据格式和接口规范
* 合约构建的RDF数据需要符合[Schema Standard](/protocol/protocol-zh/schema-standard/overview.md)

基于Contract Open Standard，Relation Protocol预制了一组Base Contracts，主要应用于以下三种场景：

**Identity**：通过SBT合约描述用户的个人身份

* Name Service合约

**Relationships**：通过SBT合约描述人与人之间的联系

* Follow
* DAO

**Publication**：通过SBT描述用户向大众或特定对象公开发布的内容

* Content
* Privacy Content

<figure><img src="/files/DI35bJNoQXnkCit68B98" alt=""><figcaption><p>图 5-1 Base Contracts</p></figcaption></figure>


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