Vocab for combinations of keywords

[gregsdennis]

The keyword set defined by the core vocabs can do lots of things, but sometimes those things are difficult or cumbersome to represent.

I'd like to propose a combinatorics vocab that defines keywords that represent combinations of applicators.

For example, if you wanted to require any of a number of properties, you currently have to do

{
  "anyOf": [
    { "required": [ "foo" ] },
    { "required": [ "bar" ] },
    { "required": [ "baz" ] },
    { "required": [ "qux" ] },
    { "required": [ "quux" ] },
    { "required": [ "quuz" ] }
  ]
}

or maybe (though it's not quite the same thing because the above also allows additional properties)

{
  "properties": {
    "foo": true,
    "bar": true,
    "baz": true,
    "qux": true,
    "quux": true,
    "quuz": true
  },
  "additionalProperties": false,
  "minProperties": 1
}

But the vocab could define a single keyword, e.g. anyOfRequired that does this much more simply

{
  "anyOfRequired": [ "foo", "bar", "baz", "qux", "quux", "quuz" ]
}

This vocab would be full of odds and ends like this.

A lot of keyword requests are about making things like this easier, so maybe we just have an evolving vocab to contain these "refactor" keywords.

[gregsdennis]

There is mention of this in https://github.com/json-schema-org/json-schema-spec/issues/846#issuecomment-582197653

There are a number of syntactic sugar proposals, and as @jdesrosiers notes maybe making them an additional vocabulary outside of the Core and Validation specification documents would be a good approach. - @handrews

[Era-cell]

I think there should be a minimumRequired keyword.

[gregsdennis]

@Era-cell we already have min/max properties. Is that different from what you're asking for?

[Era-cell]

@Era-cell we already have min/max properties. Is that different from what you're asking for?

Yeah its different, like: arrays have minContains so we should have minRequired which will be taking integer values

[gregsdennis]

@Era-cell you're probably going to be interested in https://github.com/json-schema-org/json-schema-spec/issues/1488. I think this covers what you're looking for.