Language-Independent Types for YAML™ Version 1.1

Last Updated On 2005-01-18

This document may be freely copied provided it is not modified.

1. Introduction

The following is the list of language-independent YAML tags defined under the domain yaml.org. The use of these tags is not mandatory. However these tags represent types that are useful across a wide range of applications and it is strongly recommended they be used whenever appropriate to promote interoperability.

New language-independent tags may be proposed on the yaml-core mailing list. This mailing list is also the forum for raising any question regarding these types.

2. Collection Types

!!map html pdf ps: Unordered set of key: value pairs without duplicates.
!!omap html pdf ps: Ordered sequence of key: value pairs without duplicates.
!!pairs html pdf ps: Ordered sequence of key: value pairs allowing duplicates.
!!set html pdf ps: Unordered set of non-equal values.
!!seq html pdf ps: Sequence of arbitrary values.

3. Scalar Types

!!binary html pdf ps: A sequence of zero or more octets (8 bit values).
!!bool html pdf ps: Mathematical Booleans.
!!float html pdf ps: Floating-point approximation to real numbers.
!!int html pdf ps: Mathematical integers.
!!merge html pdf ps: Specify one or more mappings to be merged with the current one.
!!null html pdf ps: Devoid of value.
!!str html pdf ps: A sequence of zero or more Unicode characters.
!!timestamp html pdf ps: A point in time.
!!value html pdf ps: Specify the default value of a mapping.
!!yaml html pdf ps: Keys for encoding YAML in YAML.