RJSVM/node_modules/ripple-lib/dist/npm/common/schemas/objects/issue.json

{
  "$schema": "http://json-schema.org/draft-04/schema#",
  "title": "issue",
  "description": "The currency code, and the counterparty if it's not XRP.",
  "allOf": [
    {"$ref": "amountbase"},
    {"not": {"required": ["value"]}}
  ]
}