s-line-prefix(n,c) in Spec 1.2

Jianjun Mao <[email protected]>
Newsgroups gmane.text.yaml.general
Message-ID <CAKjpmCJfi8VYHFBi3rogkSkGVEdSnx2hBQmLaAN7sxa0LdSAgg@mail.gmail.com>
Hi all,

I'm going to write my own parser for YAML.
But now I can't understand the following production.
What does this mean?  c = block-out =>
s-block-line-prefix(n)<http://www.yaml.org/spec/1.2/spec.html#s-block-line-prefix(n)>
and
what are "block-out" and "block-in" ?
Can anyone explain this clearly to me?

[67]s-line-prefix(n,c)::=c = block-out =>
s-block-line-prefix(n)<http://www.yaml.org/spec/1.2/spec.html#s-block-line-prefix(n)>
c = block-in  =>
s-block-line-prefix(n)<http://www.yaml.org/spec/1.2/spec.html#s-block-line-prefix(n)>
c = flow-out  =>
s-flow-line-prefix(n)<http://www.yaml.org/spec/1.2/spec.html#s-flow-line-prefix(n)>
c = flow-in   =>
s-flow-line-prefix(n)<http://www.yaml.org/spec/1.2/spec.html#s-flow-line-prefix(n)>
Thanks.
Jinjun

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