colons in flow sequences

Hi,

I'm trying to figure out if my YAML is valid or not.  I have the
following document:

    ---
    order: [ :year, :month, :day ]

libyaml complains because these strings start with colons.  However, in
the spec, http://yaml.org/spec/1.1, any flow node can occur as an
element of a flow sequence.

An ns-flow-node(n,c) can be an an ns-plain-single(c),
ns-plain-single(c) can start with a colon from ns-plain-first-char(c).

Am I interpreting the spec incorrectly, or is there a bug in libyaml?

Thanks!

-- 
Aaron Patterson
http://tenderlovemaking.com/

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