From: niklas | brueckenschlaeger <niklas@...>
Date: 2010-12-06T21:06:09+09:00
Subject: Re: Traverse YAML node tree with non-unique values

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Actually that document *is* invalid.
The YAML spec [1] says about mappings:
  The content of a mapping node is an unordered set of key: value node
  pairs, with the restriction that each of the keys is unique.

[1] - http://yaml.org/spec/1.2/spec.html#id2764044

On Mon, 2010-12-06 at 19:43 +0900, Martin C. wrote:
> I have a YAML document which I believe is valid (at least it would be
> representable in XML):
>=20
> purchase_order:
>   date: 10/12/2010
>   vendor: 12345
>   item:
>     product: Tomatoes
>     quantity: 5
>   item:
>     product: Eggs
>     quantity: 2
>=20
> The problem is that using YAML.read on this produces a Hash in which
> only one item occurs because (naturally) it has to be unique.
>=20
> How can one traverse the nodes in a YAML document like this?
>=20


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