Can an alias be used to define a new anchor?

Hello List,

I'm new to YAML, which we're using in a project via yaml-cpp. I stumpled
into an issue which I don't know if it's a bug in yaml-cpp or a feature of
the spec. I consulted the spec but left no wiser.

I wanted to write a node like this:
---
Images:
 one:
  size_x: &ONE_SIZE 100
 two:
  size_x: &TWO_SIZE *ONE_SIZE

That is, I was hoping to use an alias to define a new anchor. The
motivation is that *TWO_SIZE is used lower down independently of *ONE_SIZE,
yet they are sometimes, but not always, one and the same thing.

yaml-cpp refuses to parse this. Is it legal YAML?

Thanks in advance!

Bartek

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