Rels are the classifying part of a Resource. The following Rels are supported by Findsi.
| Name | Actor | Target | Description | Link |
| yes | yes | A well formed e-mail address | Wikipedia article | |
| yes | yes | Facebook profile url | ||
| Ip | no | yes | A well formed IP address | - |
| yes | yes | LinkedIn profile url | ||
| yes | yes | Twitter handle in the format “@username” | ||
| Ean | no | yes | European Article Number | Wikipedia article |
| Gtin | no | yes | - | Wikipedia article |
| Ipi | yes | yes | Interested Parties Information | Wikipedia article |
| Isbn | no | yes | International Standard Book Number | Wikipedia article |
| Isni | yes | yes | International Standard Name Identifier | Wikipedia article |
| Isrc | no | yes | International Standard Recording Code | Wikipedia article |
| Iswc | no | yes | International Standard Musical Work Code | Wikipedia article |
| Jan | no | yes | Japanese Article Number | Wikipedia article |
| Upc | no | yes | Universal Product Code | Wikipedia article |
| Url | no | yes | A well formed url | - |
Note that this list is likely to expand as adoption of Findsi spreads across different markets. If you feel that support for a specific Rel needs to be added, feel free to contact us.