Write valid YAML without indentation by using curly-braces. See 3.this.is.a.valid.explicit.yaml

1.this.is.a.xml

<Colors>
  <Red>FF0000</Red>
  <Blue>0000FF</Blue>
  <Green>008000</Green>
</Colors>

2.this.is.a.valid.indented.yaml

Colors:
  Red: FF0000
  Blue: 0000FF
  Green: 008000
  

3.this.is.a.valid.explicit.yaml

Colors: {
Red: FF0000,
    Blue: 0000FF,
  Green: 008000,

}

4.mix.and.match.explicit.and.indentation.in.yaml

Name: List of CSS color codes

# explicit curly-brace start-end tags are used to denote scope
# the elements in the same scope are separate with commas, like in JSON.
BasicColors: {
Red: FF0000,
    Blue: 0000FF,
  Green: 008000,

}

#indentation is used to denote scope
OtherColors:
  Yellow: FFFF00
  Maroon: 800000
  Lime: 00FF00
  

5.this.is.a.invalid.yaml

Colors: 
Red: FF0000
    Blue: 0000FF
  Green: 008000