How do I validate multiple schema using Json.net?

Question

I have following scenario of incoming messages from different devices to processing unit which shall process the messages based on message type.

1. Messages with following Schema definition for hobbies, say schema-hobbies

   JSchema hobbiesSchema = JSchema.Parse(@"{
                  'type': 'object',
                  'properties': {
                  'name': {'type':'string'},
                  'hobbies': {
                     'type': 'array',
                     'items': {'type':'string'}
                  }}}");
   

2. Messages with following Schema definition for countries, say schema-countries

   JSchema countriesSchema = JSchema.Parse(@"{
                  'type': 'object',
                  'properties': {
                  'name': {'type':'string'},
                  'countries': {
                     'type': 'array',
                     'items': {'type':'string'}
                  }}}");
   

3. Messages which do not follow any of above Schema definitions

Now, I am able to validate the hobbies messages as follow

    JObject hobbies = JObject.Parse(@"{
    'name': 'James',
    'hobbies': ['.NET', 'Blogging', 'Reading', 'Xbox', 'LOLCATS']
    }");

    IList<string> errorMessages;
    bool valid = hobbies.IsValid(hobbiesSchema , out errorMessages);

    Console.WriteLine(valid);

I shall able to merge both schema and validate different incoming messages. How can I do that?

For example:

If message Json is,

    {
    'name': 'James',
    'hobbies': ['.NET', 'Blogging', 'Reading', 'Xbox', 'LOLCATS']
    }

Output shall be: True

If message Json is,

    {
    'name': 'James',
    'countries': ['India', 'Australia']
    }

Output shall be: True

If message Json is,

    {
    'Time': '03:45 AM',
    'heartbeats': ['30', '45']
    }

Output shall be: False

Note:

1. Sample schema used in this question is just for reference. Real schema is very complex.