The same tag for different kinds

Hi all,
does the specification put any restriction on how the same tag can be used
for
different node kinds (scalar, sequence, mapping) ?
For instance, must the parser provide a possibility to define 3 different
ways to construct a node for the document below ?
Is this a valid document ?

%YAML 1.1
---
scalar: !foo bar
seq: !foo [bar]
map: !foo {bar: null}

Cheers,
Andrey

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