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YAML Reference Parser: http://yaml.org/ypaste/

array1: &my_array_alias
- foo
- bar

array2:
- <: *my_array_alias
- baz

array1: &my_array_alias
- foo
- bar

array2:
- <<
- *my_array_alias
- baz

array1: &my_array_alias
- foo
- bar

array2:
- <<: *my_array_alias
- baz

>°
·→
·detected
  !!str "\t·detected\n",
  !!str "\t\ndetected\n",
array1: &my_array_alias
  - foo
  - bar

array2:
  << *my_array_alias
  - baz
array1:
  - foo
  - bar

array2:
  - foo
  - bar
  - baz
%YAML 1.2

---
!!map {
  !!str "A null" : !!null "null",
  !!str "Also a null" : !!null "",
  !!str "Not a null" : !!str "",
  !!str "Booleans: !!seq [
    !!bool "true", !!bool "True",
    !!bool "false", !!bool "FALSE",
  ],

#! this is the beginning of a block comment.

Block comments are useful for long texts (documentation), disabling big pieces of data (useful on config files) and maybe more

#! this line marks the end of the block comment.
keep: |+
  # text↓
↓
·# Trail
··# comments.
!!str "# text\n"
!!str "# text\n\n"
2016-01-01 12:34:56.789: foo
2016-01-02 12:34:56.789: bar
%YAML 1.2

---
!!map {
  ? !!str "matches %" : !!int "20"
}
...
%YAML 1.2

---
!!null ""

%YAML 1.2

---
!!seq [
  !!null "",
  !!str "block node\n",
  !!seq [
    !!str "one"
    !!str "two",
  ],
  !!map {
    ? !!str "one"
    : !!str "two",
  },
]

en:
  info: |
    Hello!

    Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. 

    Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum. 
yaml:
  Kira
  # Comment
  Goddess

before:release:
  # [INFO] Commit and push CHANGELOG changes:
  # [INFO] Overwrite master branch from SashaDevelop branch:
  # https://stackoverflow.com/a/2763118/5951529
  # https://github.com/Kristinita/SashaGitHub/commit/016ea890a1f8a7facfb357e2f244c22ee5aff94c
  # [NOTE] Checkout force required, because you can have an error:
  # “error: Your local changes to the following files would be overwritten by checkout”
  # https://stackoverflow.com/a/32556166/5951529
  # [INFO] Use “--no-ff”, that merge with commit:
  # https://ru.stackoverflow.com/a/573773/199934
  git commit -m "Changelog ${version}" &&
  git push origin HEAD &&
  git merge --no-ff --strategy=ours master &&
  git checkout -f master &&
  git merge --no-ff SashaDevelop
before:release:
  # [INFO] Commit and push CHANGELOG changes:
  git commit -m "Changelog ${version}" &&
  git push origin HEAD &&
  # [INFO] Overwrite master branch from SashaDevelop branch:
  # https://stackoverflow.com/a/2763118/5951529
  # https://github.com/Kristinita/SashaGitHub/commit/016ea890a1f8a7facfb357e2f244c22ee5aff94c
  git merge --no-ff --strategy=ours master &&
  # [NOTE] Checkout force required, because you can have an error:
  # “error: Your local changes to the following files would be overwritten by checkout”
  # https://stackoverflow.com/a/32556166/5951529
  git checkout -f master &&
  # [INFO] Use “--no-ff”, that merge with commit:
  # https://ru.stackoverflow.com/a/573773/199934
  git merge --no-ff SashaDevelop
ERROR:

while parsing a block mapping
  in "<unicode string>", line 1, column 1:
    yaml:
    ^
expected <block end>, but found '<scalar>'
  in "<unicode string>", line 4, column 3:
      Goddess
-- it must to be a valid URI prefix
++ it must also be a valid URI prefix

-- In particular, every documents in
++ In particular, every document in

---
{ matches
% : 20 }

%YAML 1.2

---
!!map {
  ? !!str "First occurrence"
  : &A !!str "Foo",
  ? !!str "Second occurrence"
  : *A,
  ? !!str "Override anchor"
  : &B !!str "Bar",
  ? !!str "Reuse anchor"
  : *B,
}

irb(main):001:0> require 'yaml'
=> true
irb(main):002:0> YAML.load 'run_on_local_disk: yes'
=> {"run_on_local_disk"=>true}

  -- make as much use as possible of the the YAML tag repository
  ++ make as much use as possible of the YAML tag repository

{five: six,seven : eight}

{
"adjacent":value,
"readable":·value,
"empty":°
}

{
···"adjacent":value,
··"readable":·value,
··"empty":°
}

%YAML 1.2

---
!!map {
  !!str "A null" : !!null "null",
  !!str "Booleans: !!seq [
    !!bool "true", !!bool "false"
  ],
  !!str "Integers": !!seq [
    !!int "0", !!int "-0",
    !!int "3", !!int "-19"
  ],
  !!str "Floats": !!seq [
    !!float "0.", !!float "-0.0",
    !!float "12e03", !!float "-2E+05"
  ],
  !!str "Invalid": !!seq [
    # Rejected by the schema
    True, Null, 0o7, 0x3A, +12.3,
  ],
}
...

In a multi-line double-quoted scalar,
line breaks are are subject to flow line folding,
which discards any trailing white space characters

It is also possible to escape the line break character.
In this case, the line break is excluded from the content,
and the trailing white space characters are preserved.

All leading and trailing white space characters are excluded from the content.

%YAML 1.3
%CRC 2781421733
---
foo: 1
bar: 2
baz: 3
...
%YAML 1.3
%MD5 106a5a4201f0af8d078eacb71338b779
---
foo: 1
bar: 2
baz: 3
...
%YAML 1.3
%SHA256 f4a3d80e6d80b47f909d97936e75b4adc595266093b548d292a715ac2c888c3a
---
foo: 1
bar: 2
baz: 3
...
%YAML 1.3
%SIG XFwbkYCUxIInwVWdI9fYmbVj3jg
---
foo: 1
bar: 2
baz: 3
...
%YAML 1.3
---
foo: 1
bar: 2
baz: 3
...
# HMAC_SHA256.Z2BCz_ioHPu4J6XpissfpL38N6_0eOR4RwyB5IZu-kY
---
foo: 4
bar: 5
baz: 6
...
# HMAC_SHA256.TKpvn-noboJhfBadb_oH0PJiArCpnt5rCLWEwWbwVNA
#!/usr/bin/env python
from itsdangerous import Signer
import hashlib

with open("test.yml") as f:
    data = f.read()
s = Signer('secret',key_derivation = 'hmac', digest_method=hashlib.sha256)
output = s.sign(data)
hmac_sha256 = output.split(".")[-1]
print(hmac_sha256)
-- " # Strip:\n  # Comments:"
++ " # Strip:\n  # comments:"

%YAML 1.2

---
!!seq [
  !!map {
     !!str "sun" : !!str "yellow",
  },
  !!map {
    ? !!map {
      ? !!str "earth"
      : !!str "blue"
    },
    : !!map {
      ? !!str "moon"
      : !!str "white"
    },
  }
]

%YAML 1.2

---
!!seq [
  !!map {
     ? !!str "sun" : !!str "yellow",
  },
  !!map {
    ? !!map {
      ? !!str "earth"
      : !!str "blue"
    }
    : !!map {
      ? !!str "moon"
      : !!str "white"
    },
  }
]

(missing ? and redundant ,)

%YAML 1.2
--- |
%!PS-Adobe-2.0
...
%YAML1.2

---
# Empty
...

%TAG !e! tag:example,2000:app/

---
- !e! foo
- !h!bar baz

ERROR:
- The !o! handle has no suffix.
- The !h! handle wasn't declared.

---
# Use this (Presentation Model):
name: users
content: !!table |
  |      id | name     | type  | gender |
  +---------+----------+-------+--------+
  |       1 / Leonardo | Human | male   |
  |         | M. Carre |       |        |
  |         | iro      /       |        |
  |      10 | Isadora  | Human | female |
  | 2654895 | Princesa | Dog   | female |
  | 2654896 | Pitoco   | Dog   | male   |
---
# To get this (Representation Model):
name: users
content:
  - id: 1
    name: Leonardo M. Carreiro
    type: Human
    gender: male
  - id: 10
    name: Isadora Dias
    type: Human
    gender: female
  - id: 2654895
    name: Princesa
    type: Dog
    gender: female
  - id: 2654896
    name: Pitoco
    type: Dog
    gender: male
# Use this (Presentation Model):
name: map-resources-to-roles
content: !!matrix |
  |           || admin | moderator | reader |
  +-----------++-------+-----------+--------+
  | list      ||   X   |     X     |    X   |
  | get       ||   X   |     X     |    X   |
  | create    ||   X   |     X     |        |
  | edit      ||   X   |     X     |        |
  | delete    ||   X   |           |        |
---
# To get this (Representation Model):
name: map-resources-to-roles
content:
  - list:
    - admin: X
    - moderator: X
    - reader: X
  - get:
    - admin: X
    - moderator: X
    - reader: X
  - create:
    - admin: X
    - moderator: X
    - reader: ~
  - edit:
    - admin: X
    - moderator: X
    - reader: ~
  - delete:
    - admin: X
    - moderator: ~
    - reader: ~
# Use this (Presentation Model):
name: some-matrix-of-weights
content: !!bare-matrix |
  +---+----+---+
  | 4 |  7 | 2 |
  | 9 | 10 | 1 |
  | 7 |  4 | 5 |
---
# To get this (Representation Model):
name: some-matrix-of-weights
content:
  - -  4
    -  7
    -  2
  - -  9
    - 10
    -  1
  - -  7
    -  4
    -  5
%YAML 1.2

---
!!str "Document"
...
%YAML 1.2

---
!!null ""
...
%YAML 1.2

---
!!map {
  !!str "matches %": !!int "20"
}

-- Please report errors in this document to the [yaml-core](https://yaml.org/spec/1.2/spec.html) mailing list.
++ Please report errors in this document to the [yaml-core](http://lists.sourceforge.net/lists/listinfo/yaml-core) mailing list.

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