[Yaml-core] YPaste parsing for properties

[Burt H. <Bur...@mi...>]

The ypaste tool at http://dev.yaml.org is great.   One experiment I tried:

        !foo !bar
        One: two

Results surprise me, it seems to have parsed !foo and !bar both as properti=
es
of the mapping.   I didn't think that was allowed under the current rules.

I was expecting !bar to be tied One, rather than the mapping, which is what
happened if I moved !bar to the next line:

        !foo
        !bar One: two

Finally, and most surprisingly, if I put it all on one line, I get an error=
:

        !foo !bar One: two

Is any of this intended?