Scalar types

n1: 1            # integer 
n2: 1.234        # float 
s1: 'abc'        # string 
s2: "abc"        # string 
s3: abc          # string 
b: false         # boolean type 
d: 2015-04-05    # date type

#↓ Equivalent JSON

{
  "n1": 1,
  "n2": 1.234,
  "s1": "abc",
  "s2": "abc",
  "s3": "abc",
  "b": false,
  "d": "2015-04-05"
}

Use spaces to indent. There must be space between the element parts.