private static void MarkExternalFields(ISchemaBuilder schemaBuilder, DocumentNode document)
{
Dictionary <NameString, ISet <NameString> > externalFieldLookup =
new Dictionary <NameString, ISet <NameString> >();
foreach (ObjectTypeDefinitionNodeBase objectType in
document.Definitions.OfType <ObjectTypeDefinitionNodeBase>())
{
if (!externalFieldLookup.TryGetValue(
objectType.Name.Value,
out ISet <NameString>?externalFields))
{
externalFields = new HashSet <NameString>();
externalFieldLookup.Add(objectType.Name.Value, externalFields);
}
MarkExternalFields(objectType.Fields, externalFields);
}
schemaBuilder.AddExternalFieldLookup(externalFieldLookup);
}