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%YAML 1.1 # Reference card
---
Collection indicators:
'? ' : Key indicator.
': ' : Value indicator.
'- ' : Nested series entry indicator.
', ' : Separate in-line branch entries.
'[]' : Surround in-line series branch.
'{}' : Surround in-line keyed branch.
Scalar indicators:
'''' : Surround in-line unescaped scalar ('' escaped ').
'"' : Surround in-line escaped scalar (see escape codes below).
'|' : Block scalar indicator.
'>' : Folded scalar indicator.
'-' : Strip chomp modifier ('|-' or '>-').
'+' : Keep chomp modifier ('|+' or '>+').
1-9 : Explicit indentation modifier ('|1' or '>2').
# Modifiers can be combined ('|2-', '>+1').
Alias indicators:
'&' : Anchor property.
'*' : Alias indicator.
Tag property: # Usually unspecified.
none : Unspecified tag (automatically resolved by application).
'!' : Non-specific tag (by default, "!!map"/"!!seq"/"!!str").
'!foo': Primary (by convention, means a local "!foo" tag).
'!!foo': Secondary (by convention, means "tag:yaml.org,2002:foo").
'!h!foo': Requires "%TAG !h! <prefix>" (and then means "<prefix>foo").
'!<foo>': Verbatim tag (always means "foo").
Document indicators:
'%' : Directive indicator.
'---' : Document header.
'...' : Document terminator.
Misc indicators:
'#' : Throwaway comment indicator.
'`@' : Both reserved for future use.
Special keys:
'=' : Default "value" mapping key.
'<<' : Merge keys from another mapping.
Core types: # Default automatic tags.
'!!map' : [ Hash table, dictionary, mapping ]
'!!seq' : [ List, array, tuple, vector, sequence ]
'!!str' : Unicode string
More types:
'!!set' : { cherries, plums, apples }
'!!omap' : [ one: 1, two: 2 ]
Language Independent Scalar types:
{ ~, null } : Null (no value).
{ 1234, 0x4D2, 02333 } : [ Decimal int, Hexadecimal int, Octal int ]
{ 1_230.15, 12.3015e+02 } : [ Fixed float, Exponential float ]
{ .inf, -.Inf, .NAN } : [ Infinity (float), Negative, Not a number ]
{ Y, true, Yes, ON } : Boolean true
{ n, FALSE, No, off } : Boolean false
? !!binary >
R0lG...BADS=
: >-
Base 64 binary value.
Escape codes:
Numeric : { "\xXX": 8-bit, "\uXXXX": 16-bit, "\UXXXXXXXX": 32-bit }
Protective: { "\\": '\', "\"": '"', "\ ": ' ', "\<TAB>": "<TAB>", "\^": '^' }
C: { "\a": BEL, "\b": BS, "\f": FF, "\n": LF, "\r": CR, "\t": TAB, "\v": VTAB }
Additional: { "\e": ESC, "\0": NUL, "\_": NBSP, "\N": NEL, "\L": LS, "\P": PS }
...