This is a plugin using yaml.

see ​http://yuml.me/diagram/scruffy/class/samples

This is an example use case using yaml:

Error: Failed to load processor YumlUseCase

No macro or processor named 'YumlUseCase' found

This is an example class diagram:

Error: Failed to load processor YumlClass

No macro or processor named 'YumlClass' found

This is an example activity diagram:

Error: Failed to load processor YumlActivity

No macro or processor named 'YumlActivity' found