ClickHouse/programs/server/config-example.yaml.disabled

# We can use 3 main node types in YAML: Scalar, Map and Sequence.



# A Scalar is a simple key-value pair:

scalar: 123

# Here we have a key "scalar" and value "123"
# If we rewrite this in XML, we will get <scalar>123</scalar>

# We can also represent an empty value with '':

key: ''



# A Map is a node, which contains other nodes:

map:
  key1: value1
  key2: value2
  small_map:
    key3: value3
    
# This map can be converted into:
# <map>
#     <key1>value1</key1>
#     <key2>value2</key2>
#     <small_map>
#         <key3>value3</key3>
#     </small_map>
# </map>



# A Sequence is a node, which contains also other nodes.
# The main difference from Map is that Sequence can also contain simple values.

sequence:
  - val1
  - val2
  - key: 123
  - map:
      mkey1: foo
      mkey2: bar
      
# We can represent it in XML this way:
# <sequence>val1</sequence>
# <sequence>val2</sequence>
# <sequence>
#     <key>123</key>
# </sequence>
# <sequence>
#     <map>
#         <mkey1>foo</mkey1>
#         <mkey2>bar</mkey2>
#     </map>
# </sequence>



# YAML does not have direct support for structures like XML attributes.
# We represent them as nodes with @ prefix in key. Note, that @ is reserved by YAML standard,
# so you will need to write double quotes around the key. Both Map and Sequence can have
# attributes as children nodes

map:
  "@attr1": value1
  "@attr2": value2
  key: 123
  
# This gives us:
# <map attr1="value1" attr2="value2">
#     <key>123</key>
# </map>

sequence:
  - "@attr1": value1
  - "@attr2": value2
  - 123
  - abc
  
# And this gives us:
# <map attr1="value1" attr2="value2">123</map>
# <map attr1="value1" attr2="value2">abc</map>