In SQLAlchemy, how do I define an event to fire DDL using declarative syntax?

This example shows how to use it with "non-declarative" - http://docs.sqlalchemy.org/en/latest/core/ddl.html#sqlalchemy.schema.DDL

How can I use it with the ORM declarative syntax?

For example, with this structure:

Base = declarative_base(bind=engine)     
class TableXYZ(Base):
    __tablename__ = 'tablexyz'