JSON schema for object with either A and B or C required properties - jsonschema

Question

I have two possible JSON objects for one request:
{
"from": "string",
"to": "string",
"text": "string"
}
or
{
"number": "integer",
"text": "string"
}
In both cases "text" property is optional. Other properties are required (either "number, or both "from" and "to").
What will be the correct JSON schema to validate this?

Answer 1

Here is another solution that I think is a bit more clear. The dependencies clause ensures that "from" and "to" always come as a pair. Then the oneOf clause can be really simple and avoid the not-required boilerplate.
{
"type": "object",
"properties": {
"from": { "type": "string" },
"to": { "type": "string" },
"number": { "type": "integer" },
"text": { "type": "string" }
},
"dependencies": {
"from": ["to"],
"to": ["from"]
},
"oneOf": [
{ "required": ["from"] },
{ "required": ["number"] }
]
}

Answer 2

Finally managed to build the correct scheme.
{
"definitions": {
"interval": {
"type": "object",
"properties": {
"from": {
"type": "string"
},
"to": {
"type": "string"
},
"text": {
"type": "string"
}
},
"required": ["from", "to"],
"not": {
"required": ["number"]
}
},
"top": {
"type": "object",
"properties": {
"number": {
"type": "integer"
},
"text": {
"type": "string"
}
},
"required": ["number"],
"allOf": [
{
"not": {
"required": ["from"]
}
},
{
"not": {
"required": ["to"]
}
}
]
}
},
"type": "object",
"oneOf": [
{"$ref": "#/definitions/interval"},
{"$ref": "#/definitions/top"}
]
}