does build.yaml artifacts support hashes?

[Shane Witbeck]

I'm attempting to use the following in build.yaml but I get an error:

artifacts:
  aopalliance: aopalliance:aopalliance:jar:1.0
  aspectj:
    rt: aspectj:aspectjrt:jar:1.5.3
    weaver: aspectj:aspectjweaver:jar:1.5.3
  log4j: log4j:log4j:jar:1.2.15


The error is:

buildr aborted!
no such option: rt weaver


I have traditionally referenced a file using struct to group my artifacts
but I'd like to use build.yaml instead. Any ideas?

-Shane