What is the purpose of a binary schema and schema registry?

[John Wilson]

Hi,

When objects are marshaled, Ignites adds a schema (BinarySchema) to the
BinarySchemaRegistry. Moreover, the documentation says that an object can
have a few different schemas.

My question:

   1. What does it mean for an object to have multiple schemas? (e.g. for a
   simple person object Person obj = new Person())
   2. What is the purpose of the binary schema registry?

Thanks,