> ## Documentation Index
> Fetch the complete documentation index at: https://docs.encord.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Project ontology.ontology classification

## OntologyClassification Objects

```python theme={"dark"}
@dataclass
class OntologyClassification()
```

DEPRECATED: prefer using [Ontology](/sdk-documentation/sdk-references/ontology#ontology)

A dataclass which holds classifications of the [Ontology](/sdk-documentation/sdk-references/project_ontology.ontology#ontology).

#### id

A unique (to the ontology) identifier of the classification.

#### feature\_node\_hash

An 8-character hex string uniquely defining the option.

#### attributes

A List of attributes for the classification.