$data reference is not supported (compatibility with AJV)

[thatside-zaraffa]

It is not possible to use $data reference in schema like:

"password": {
      "type": "string"
  },
  "passwordRepeat": {
      "type": "string",
      "const": { "$data": "#/register/password" 
}

AJV already supports this: ajv-validator/ajv#289
Discussion on this feature in JSON Schema repo: json-schema-org/json-schema-spec#51 #

[bighappyface]

PRs are welcome

[handrews]

Note that $data remains a controversial proposal and is not guaranteed to be added to the spec in the future. We will probably resolve it one way or the other during draft-09 (so, probably six months to a year from now, depending on how long it takes us to finish the current draft-08 work).

[thatside]

A little bit more info here (for those who will read this issue): opis/json-schema#1