root/trunk/spec/refcard.txt

%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 }
...