code: <S extends Storable> JDBCStorableProperty<S>
          getJDBCStorableProperty(StorableProperty<S> property)
          throws RepositoryException, SupportException
      {
          JDBCStorableInfo<S> info = examineStorable(property.getEnclosingType());
          JDBCStorableProperty<S> jProperty = info.getAllProperties().get(property.getName());
          if (!jProperty.isSupported()) {
              throw new UnsupportedOperationException
                  ("Property is not supported: " + property.getName());
          }
          return jProperty;
      }
docs: Convenience method to convert a regular StorableProperty into a
  JDBCStorableProperty.
  
  @throws UnsupportedOperationException if JDBCStorableProperty is not supported