--- %YAML:1.0 
test: Empty Sequence 
brief: > 
    You can represent the empty sequence 
    with an empty inline sequence. 
yaml: | 
    empty: [] 
python: | 
    [ 
        { 'empty': [] } 
    ] 
ruby: | 
    { 'empty' => [] } 
 
--- 
test: Empty Mapping 
brief: > 
    You can represent the empty mapping 
    with an empty inline mapping. 
yaml: | 
    empty: {} 
python: | 
    [ 
        { 'empty': {} } 
    ] 
ruby: | 
    { 'empty' => {} } 
 
--- 
test: Empty Sequence as Entire Document 
yaml: | 
    --- [] 
python: | 
    [ [] ] 
ruby: | 
    [] 
 
--- 
test: Empty Mapping as Entire Document 
yaml: | 
    --- {} 
python: | 
    [ {} ] 
ruby: | 
    {} 
 
---  
test: Null as Document 
yaml: | 
    --- ~ 
python: | 
    [ None ] 
ruby: | 
    nil 
 
--- 
test: Empty String 
brief: > 
    You can represent an empty string 
    with a pair of quotes. 
yaml: | 
    --- '' 
python: | 
    [ '' ] 
ruby: | 
    ''