code: public static ZooClassDef bootstrapZooPCImpl() {
  		//The bootstrapped schemata have a fixed OID.
  		//This is because they also need to be created every time we open a database.
  		//They are required to actually read the boot-schema from the database ....
  		//Actually, we don't really need to read them, but they shold be in the database
  		//anyway, for consistency.
  		//TODO maybe we don't need to store ZooClassDef????
  		// -> and ZooPC does not need to be bootstrapped in memory????
  		ZooClassDef x = new ZooClassDef(ZooPC.class.getName(), 50, 0, 50, 0);
  		x.cls = ZooPC.class;
  		x.className = ZooPC.class.getName();
  		//x.associateFields(); //doesn't seem to be necessary
  		return x;
  	}
docs: Methods used for bootstrapping the schema of newly created databases.
  @return Root schema