- YAML Tutorial
- YAML - Home
- YAML – Introduction
- YAML – Basics
- YAML – Indentation and Separation
- YAML – Comments
- YAML – Collections and Structures
- YAML – Scalars and Tags
- YAML – Full Length Example
- YAML – Processes
- YAML – Information Models
- YAML – Syntax Characters
- YAML – Syntax Primitives
- YAML – Character Streams
- YAML – Node Properties
- YAML – Block Scalar Header
- YAML – Flow Styles
- YAML – Block Styles
- YAML – Sequence Styles
- YAML – Flow Mappings
- YAML – Block Sequences
- YAML – Failsafe Schema
- YAML – JSON Schema
- YAML Useful Resources
- YAML - Quick Guide
- YAML - Useful Resources
- YAML - Discussion
YAML - Syntax Characters
Various types of characters are used for various functionalities. This chapter talks in detail about syntax used in YAML and focuses on character manipulation.
Indicator Characters
Indicator characters include a special semantics used to describe the content of YAML document. The following table shows this in detail.
| Sr.No. | Character & Functionality |
|---|---|
| 1 | _ It denotes a block sequence entry |
| 2 | ? It denotes a mapping key |
| 3 | : It denotes a mapping value |
| 4 | , It denotes flow collection entry |
| 5 | [ It starts a flow sequence |
| 6 | ] It ends a flow sequence |
| 7 | { It starts a flow mapping |
| 8 | } It ends a flow mapping |
| 9 | # It denotes the comments |
| 10 | & It denotes node’s anchor property |
| 11 | * It denotes alias node |
| 12 | ! It denotes node’s tag |
| 13 | | It denotes a literal block scalar |
| 14 | > It denotes a folded block scalar |
| 15 | ` Single quote surrounds a quoted flow scalar |
| 16 | " Double quote surrounds double quoted flow scalar |
| 17 | % It denotes the directive used |
The following example shows the characters used in syntax −
%YAML 1.1
---
!!map {
? !!str "sequence"
: !!seq [
!!str "one", !!str "two"
],
? !!str "mapping"
: !!map {
? !!str "sky" : !!str "blue",
? !!str "sea" : !!str "green",
}
}
# This represents
# only comments.
---
!!map1 {
? !!str "anchored"
: !local &A1 "value",
? !!str "alias"
: *A1,
}
!!str "text"
