| Parameters: | 
- spec : 
dict, optional 
Dictionary mapping str name to TableSpec, as returned by
SchemaConfig.toSpec.  Will be constructed from default configuration
if not provided. 
 
 
 | 
| Attributes: | 
- metadata : 
sqlalchemy.MetaData 
The sqlalchemy schema description. 
 
- tables : 
dict 
A mapping from table or view name to the associated SQLAlchemy object.
Note that this contains both true tables and views. 
 
- views : 
set 
The names of entries in tables that are actually implemented as
views. 
 
 
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