YUML支持3种图示风格，分别是：

1. plain
2. scruffy
3. boring

用例图

1. 角色(Actor)
2. 使用[角色名]

![](http://yuml.me/diagram/plain/usecase/[Customer])

<(Register),(Login)<(Request Password Reminder),(Register)>(Confirm Registration))

完整示例

plain

![](http://yuml.me/diagram/plain/usecase/(note: figure  1.2{bg:beige}), [User]-(Login),[Site Maintainer]-(Add User),(Add User)<(Add Company),[Site Maintainer]-(Upload Docs),(Upload Docs)<(Manage Folders),[User]-(Upload Docs),[User]-(Full Text Search Docs), (Full Text Search Docs)>(Preview Doc),(Full Text Search Docs)>(Download Docs),[User]-(Browse Docs), (Browse Docs)>(Preview Doc),[Site Maintainer]-(Post New Event To The Web Site),[User]-(View Events))

, [User]-(Login),[Site Maintainer]-(Add User),(Add User)<(Add Company),[Site Maintainer]-(Upload Docs),(Upload Docs)<(Manage Folders),[User]-(Upload Docs),[User]-(Full Text Search Docs), (Full Text Search Docs)>(Preview Doc),(Full Text Search Docs)>(Download Docs),[User]-(Browse Docs), (Browse Docs)>(Preview Doc),[Site Maintainer]-(Post New Event To The Web Site),[User]-(View Events))

scruffy

, [User]-(Login),[Site Maintainer]-(Add User),(Add User)<(Add Company),[Site Maintainer]-(Upload Docs),(Upload Docs)<(Manage Folders),[User]-(Upload Docs),[User]-(Full Text Search Docs), (Full Text Search Docs)>(Preview Doc),(Full Text Search Docs)>(Download Docs),[User]-(Browse Docs), (Browse Docs)>(Preview Doc),[Site Maintainer]-(Post New Event To The Web Site),[User]-(View Events))

boring

, [User]-(Login),[Site Maintainer]-(Add User),(Add User)<(Add Company),[Site Maintainer]-(Upload Docs),(Upload Docs)<(Manage Folders),[User]-(Upload Docs),[User]-(Full Text Search Docs), (Full Text Search Docs)>(Preview Doc),(Full Text Search Docs)>(Download Docs),[User]-(Browse Docs), (Browse Docs)>(Preview Doc),[Site Maintainer]-(Post New Event To The Web Site),[User]-(View Events))

nofunky

, [User]-(Login),[Site Maintainer]-(Add User),(Add User)<(Add Company),[Site Maintainer]-(Upload Docs),(Upload Docs)<(Manage Folders),[User]-(Upload Docs),[User]-(Full Text Search Docs), (Full Text Search Docs)>(Preview Doc),(Full Text Search Docs)>(Download Docs),[User]-(Browse Docs), (Browse Docs)>(Preview Doc),[Site Maintainer]-(Post New Event To The Web Site),[User]-(View Events))