anchor.diff:  AUTOCOMMIT must be turned ON (the default) for the session.
   
   ```
  -DROP SCHEMA schema-name [RESTRICT|CASCADE]
  +DROP SCHEMA schema-name [IF EXISTS] [RESTRICT|CASCADE]
   ```
   
   [[drop_schema_syntax]]
  
positive.code: any database user may add objects to the schema (SHARED). The default class is PRIVATE.
  +
  NOTE: Schemas created in {project-name} Release 0.9 or earlier are SHARED schemas.
  
  * `_schema-name_`
  +
  
negative.code: AUTOCOMMIT must be turned ON (the default) for the session.
  
  ```
  CREATE [schema-class] SCHEMA [IF NOT EXISTS] schema-clause
  
  schema-class is:
     [ PRIVATE | SHARED ]
  