Copyright © 2001-2005 Oren Ben-Kiki, Clark Evans, Brian Ingerson
This specification is a draft reflecting consensus reached by members of the yaml-core mailing list. Any questions regarding this draft should be raised on this list.
Ordered sequence of key:value pairs allowing duplicates.
A common type used for modeling is the ordered list of named values, allowing duplicates. For example, this is one of the basic constructs used to model XML data. YAML provides a shorthand notation for representing this data type as a sequence of one-key mappings.
Most programming languages do not have a built-in native data type
for supporting pairs. Such data types are usually provided by
libraries. If no such data type is available, an application may
resort to loading
!!pairs into a native
array of hash tables containing one key each.
!!pairs tag may be given explicitly.
Alternatively, the application may choose to implicitly type a
sequence of single-key mappings to pairs. In this case, an explicit
!!seq transfer must be given to sequences of
single-key mappings that do not represent pairs.