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Orderly JSON

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Orderly JSON is to JSON schema what RelaxNG is to XML Schema. This orderly:

object {
    string name;
    string description?;
    string homepage /^http:/;
    integer {1500,3000} invented;
}*;

… describes this JSON:

{
    "name": "orderly",
    "description": "A schema language for JSON",
    "homepage": "http://orderly-json.org",
    "invented": 2009
}

… and compiles into JSON schema:

{
    "type": "object",
    "properties": {
        "name": {
            "type": "string"
        },
        "description": {
            "type": "string",
            "optional": true
        },
        "homepage": {
            "type": "string",
            "pattern": "^http:"
        },
        "invented": {
            "type": "integer",
            "minimum": 1500,
            "maximum": 3000
        }
    },
    "additionalProperties": true
}