# How to serialize ?

## General rule
- 1 byte : type of object code
- int : version of the encoder
- data : can be the json representation of the object

### Current supported types
- E : events
- O : object (with history management)
- P : pickle 
- S : state 
- C : concept
- D : concept definitions 

## How concepts are serialized ?
- get the id of the concept
- get the hash of the concept −> it will be its unique key  
structure of the serialisation:
```json
{
  "id" : "id",
  "parent": <hash code of the previous version of the concept> or "",
  "name": <name of the concept>,
  "where": "",
  "pre": "",
  "post": "",
  "body": "",
  "desc": "",
  ...
}
``` 

## Idea to manage ObjectSerializer
Problem:  
During serialization, there is no issue. The match() method is the unique way to get the correct serialier.  
During the deserialisation, all Object serializer have type = '0' and version = 1.  
So how to choose the correct one ?  
    A possible solution will be to add the type of the object to deserialize to the saved stream  
    --> SHA256 for every object. Too much data saved.  
The id is to let to inc the version automatically in the Serialiser (during the registration) and to keep the mapping within sdp.state