Tips for Writing in YAML
The following tips could help you minimize syntax errors when writing in YAML:
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Use a text editor that supports colour coding and validates YAML.
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Set the text editor encoding to UTF-8.
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Do not use tabs. Use only space characters in the YAML syntax.
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YAML is case sensitive.
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YAML considers that a line indented with more spaces than the section or parameter on the previous line is nested inside that section or parameter in a parent/child relationship. If you want to nest several lines in the same parent section, you should indent all children lines with the same number of spaces.