| A Knowledge-Based Data Model and Query Algebra for the Next-Generation Web Recent countries visiting this post |  |
 | 4 | United States |
 | 1 | Germany |
 | 1 | |
 | 1 | China |
| A Knowledge-Based Data Model and Query Algebra for the Next-Generation Web Recent countries visiting this post | |
| 4 | United States |
| 1 | Germany |
| 1 | |
| 1 | China |