Special mapping keys
YAML serialization
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The following special keys have been implemented for !!map. By default, these keys will be taken into account when deserializing yaml documents. To keep the original document structure, configuration variables can be set. See YAML control variables.

!!merge
See https://yaml.org/type/merge.html

As per https://sourceforge.net/p/yaml/mailman/message/12308050, the merge key is implemented bottom up:

USING: yaml prettyprint ; " foo: 1 <<: bar: 2 <<: baz: 3 " yaml> .
H{ { "baz" 3 } { "foo" 1 } { "bar" 2 } }


!!value
See https://yaml.org/type/value.html

USING: yaml prettyprint ; " --- # Old schema link with: - library1.dll - library2.dll --- # New schema link with: - = : library1.dll version: 1.2 - = : library2.dll version: 2.3 " yaml-docs> .
{ H{ { "link with" { "library1.dll" "library2.dll" } } } H{ { "link with" { "library1.dll" "library2.dll" } } } }