> For the complete documentation index, see [llms.txt](https://docs.snomed.org/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.snomed.org/snomed-international-documents/snomed-ct-glossary/a/attribute/attribute-relationship.md).

# attribute relationship

## attribute relationship

A relationship between two concepts in which one concept specifies the value of a defining characteristic of the other concept.

#### Notes

* In the relationships file an attribute relationship is represented by three concept identifiers:
  * **SourceId** represents the concept defined by the attribute relationship.
  * **TypeId** represents the attribute, which has a value that is a subtype of [410662002 | Concept model attribute|](http://snomed.info/id/410662002) .
  * **DestinationId** represents the value applied to that attribute.
* Concepts are defined by a combination of *attribute relationships* and subtype relationships.

#### Example

* The table below shows an example of three *attribute* *relationships* as it appears in the three significant columns of the relationships file:

| sourceId   | typeId                    | destinationId                               |
| ---------- | ------------------------- | ------------------------------------------- |
| \[ 6025007 | Laparoscopic appendectomy | ]\(<http://snomed.info/id/6025007> "6025007 |
| \[ 6025007 | Laparoscopic appendectomy | ]\(<http://snomed.info/id/6025007> "6025007 |
| \[ 6025007 | Laparoscopic appendectomy | ]\(<http://snomed.info/id/6025007> "6025007 |

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