Github user aledsage commented on the issue:
https://github.com/apache/brooklyn-server/pull/218
@grkvlt you're right that `$brooklyn:self().attributeWhenReady("foo")`
would be a pointless thing to write. The main use-case is for when you want to
pass the entity itself as a config value (e.g. when configuring some kinds of
enricher). For example, see the yaml edit in
https://github.com/apache/brooklyn-library/pull/41/files.
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