> ## 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.classification attribute

## ClassificationAttribute Objects

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

This class is DEPRECATED. We recommend using [Ontology](/sdk-documentation/sdk-references/ontology#ontology)

A dataclass which holds classification attributes.

#### id

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

#### name

The descriptive name of the attribute.

#### classification\_type

What type of attribute it is. E.g., Checkbox or radio button.

#### required

Whether annotating this attribute is required.

#### feature\_node\_hash

An 8-character hex string uniquely defining the attribute.

#### options

Nested classification options.