When you create a tool information model, Microsoft® Repository enlarges the database schema to accommodate the new kinds of data. Generally, Repository creates one table for each new interface you create. Several interfaces, however, can share a table. (See Information Model Creation Issues.)
Each row of an interface-specific table indicates that a set of property values applies to a particular range of object versions. (See Ranges in the Version Graph.)
The primary key of any interface-specific table consists of three columns: IntID, Z_BranchID_Z, and Z_VS_Z, as shown in the following table.
| Column name | Data type | Description |
| IntID | RTIntID | The internal identifier for the object. |
| Z_BranchID_Z | RTBrID | Indicates the branch of the version graph containing the range to whose items the property values in this row apply. |
| Z_VS_Z | RTVerID | A version-within-branch identifier indicating the lower bound of the range to whose items the property values in this row apply. |
| Z_VE_Z | RTVerID | A version-within-branch identifier indicating the upper bound of the range to whose items the property values in this row apply. |
| (User-supplied column name for Interface-specific property 1) | (User-supplied datatype) | A column corresponding to a property you defined in your tool information model. You provide a name and a data type for this column when you insert the tool information model into Repository. |
| (User-supplied column name for Interface-specific property n…) | (User-supplied datatype) | Other columns corresponding to other properties you defined in your tool information model. You provide a name and a data type for each of these other columns when you insert the tool information model into Repository. |
Each row indicates a range and a set of property values. Every object version in the range is described by every property value.