YAML - Failsafe Schema

A YAML schema is defined as a combination of set of tags and includes a mechanism for resolving non-specific tags. The failsafe schema in YAML is created in such a manner that it can be used with any YAML document. It is also considered as a recommended schema for a generic YAML document.

Types

There are two types of failsafe schema: Generic Mapping and Generic Sequence

Generic Mapping

It represents an associative container. Here, each key is unique in the association and mapped to exactly one value. YAML includes no restrictions for key definitions.

An example for representing generic mapping is given below −

Clark : Evans
Ingy : döt Net
Oren : Ben-Kiki
Flow style: !!map { Clark: Evans, Ingy: döt Net, Oren: Ben-Kiki }

The output of generic mapping structure in JSON format is shown below −

{
   "Oren": "Ben-Kiki", 
   "Ingy": "d\u00f6t Net", 
   "Clark": "Evans", 
   "Flow style": {
      "Oren": "Ben-Kiki", 
      "Ingy": "d\u00f6t Net", 
      "Clark": "Evans"
   }
}

Generic Sequence

It represents a type of sequence. It includes a collection indexed by sequential integers starting with zero. It is represented with !!seq tag.

Clark : Evans
Ingy : döt Net
Oren : Ben-Kiki
Flow style: !!seq { Clark: Evans, Ingy: döt Net, Oren: Ben-Kiki }

The output for this generic sequence of failsafe

schema is shown below:
{
   "Oren": "Ben-Kiki", 
   "Ingy": "d\u00f6t Net", 
   "Clark": "Evans", 
   "Flow style": {
      "Oren": "Ben-Kiki", 
      "Ingy": "d\u00f6t Net", 
      "Clark": "Evans"
   }
}