Newtonsoft JSON Schema - $ref is resolved, ignoring required though - json

Question

I externalized a portion of my json schema into a separate schema file.
For example: "$ref": "http://schema.company.com/boroughschema.json"
Within this schema I specify required properties, when validating a known bad json file, it doesn't complain that a required property is missing.
"required": [
"Name",
"Representative",
"District"
]
I purposely leave off "District" in the source json, and there are no complaints when validating.
Using Newtonsoft.Json.Schema 3.0.11.
The original schema validates just fine, if I move the schema portion to a definitions that works as well.
private bool ValidateViaExternalReferences(string jsonstring)
{
JSchemaPreloadedResolver resolver = new JSchemaPreloadedResolver();
// load schema
var schemaText = System.IO.File.ReadAllText(COMPLEXSCHEMAFILE);
// Rather than rely on 100% http access, use a resolver and
// preload schema with http://schema.company.com/boroughschema.json
var schemaTextBorough = System.IO.File.ReadAllText(BOROUGHSCHEMAFILE);
resolver.Add(new Uri("http://schema.company.com/boroughschema.json"), schemaTextBorough);
JSchema schema = JSchema.Parse(schemaText, resolver);
JToken json = JToken.Parse(jsonstring);
// validate json
IList<ValidationError> errors;
bool valid = json.IsValid(schema, out errors);
if (!valid)
{
foreach (var validationerr in errors)
{
Append2Log(validationerr.ToString());
}
}
return valid;
}
Missing "District" yields no errors, I expect the same correct behavior when using the original schema.

Answer 1

I had placed the:
"required": [
"Name",
"Representative",
"District"
] fragment in the wrong place.
I apologize, it behaves as expected.