> For the complete documentation index, see [llms.txt](https://relationlabs.gitbook.io/protocol/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://relationlabs.gitbook.io/protocol/protocol-zh/contract-open-standard/overview.md).
# 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
图 5-1 Base Contracts
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