text: # schema.py
  # Copyright (C) 2005-2017 the SQLAlchemy authors and contributors
  # <see AUTHORS file>
  #
  # This module is part of SQLAlchemy and is released under
  # the MIT License: http://www.opensource.org/licenses/mit-license.php
  
  """Compatibility namespace for sqlalchemy.sql.schema and related.
  
  """
  
  from .sql.base import (
      SchemaVisitor
      )
  
  
  from .sql.schema import (
      BLANK_SCHEMA,
      CheckConstraint,
      Column,
      ColumnDefault,
      Constraint,
      DefaultClause,
      DefaultGenerator,
      FetchedValue,
      ForeignKey,
      ForeignKeyConstraint,
      Index,
      MetaData,
      PassiveDefault,
      PrimaryKeyConstraint,
      SchemaItem,
      Sequence,
      Table,
      ThreadLocalMetaData,
      UniqueConstraint,
      _get_table_key,
      ColumnCollectionConstraint,
      ColumnCollectionMixin
      )
  
  
  from .sql.naming import conv
  
  
  from .sql.ddl import (
      DDL,
      CreateTable,
      DropTable,
      CreateSequence,
      DropSequence,
      CreateIndex,
      DropIndex,
      CreateSchema,
      DropSchema,
      _DropView,
      CreateColumn,
      AddConstraint,
      DropConstraint,
      DDLBase,
      DDLElement,
      _CreateDropBase,
      _DDLCompiles,
      sort_tables,
      sort_tables_and_constraints
  )
  