未知的类型和属性（审核）

Question

说我正在建立一种CMS。我想存储不同类型的属性，例如房屋，公寓，建筑物，停车场等。

我可能事先不知道所有属性类型，也不知道某个属性类型可以具有的所有属性。因此，我希望用户能够通过Web UI添加自己的类型和属性。

我想到了这个，但是我觉得这是错误的：

有意义吗？有更好的方法吗？

示例数据：

TaxonType
+------+-----------------+
|  id  |      name       |
+------+-----------------+
|   1  | 'Property type' |
+------+-----------------+

Taxon
+----+---------------------+------------+--------+
| id |        taxon        | taxon_type | parent |
+----+---------------------+------------+--------+
|  1 | 'Property'          |     1      |  null  |
|  2 | 'House'             |     1      |    1   |
|  3 | 'Condominium house' |     1      |    2   |
+----+---------------------+------------+--------+

Attribute
+----+------------------+
| id |    attribute     |
+----+------------------+
|  1 |  'Surface area'  |
|  2 | 'Parking spaces' |
|  3 |     'Pool'       |
+----+------------------+

Unit
+----+----------------+--------+
| id |      unit      | symbol |
+----+----------------+--------+
|  1 | 'Square Metre' |  'm2'  |
+----+----------------+--------+

Taxon_Attribute
+-------+-------------+
| taxon |  attribute  |
+-------+-------------+
|   1   |      1      |
|   1   |      2      |
|   2   |      3      |
+-------+-------------+

Object
+----+
| id |
+----+
|  1 |
+----+

Taxonomy
+-------+--------+
| taxon | object |
+-------+--------+
|   3   |    1   |
+-------+--------+

AttributeValue
+----+-------+------------------+-----------+--------+
| id | value | measurement_unit | attribute | object |
+----+-------+------------------+-----------+--------+
|  1 | '200' |        1         |     1     |    1   |
|  2 |  '3'  |       null       |     2     |    1   |
|  3 | 'yes' |       null       |     3     |    1   |
+---+--------+------------------+-----------+--------+