# fiftyone.core.annotation.validate_label_schemas Annotation label schema validation Copyright 2017-2026, Voxel51, Inc.
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**Exceptions:** | [`ValidationErrors`](#fiftyone.core.annotation.validate_label_schemas.ValidationErrors) | Validation errors for label schemas | |-------------------------------------------------------------------------------------------|---------------------------------------| **Functions:** | [`validate_label_schemas`](#fiftyone.core.annotation.validate_label_schemas.validate_label_schemas)(sample_collection, ...) | Validates label schemas for a [`fiftyone.core.collections.SampleCollection`](fiftyone.core.collections.md#fiftyone.core.collections.SampleCollection). | |-------------------------------------------------------------------------------------------------------------------------------|----------------------------------------------------------------------------------------------------------------------------------------------------------| ### *exception* fiftyone.core.annotation.validate_label_schemas.ValidationErrors Bases: `ExceptionGroup` Validation errors for label schemas **Methods:** | [`add_note`](#fiftyone.core.annotation.validate_label_schemas.ValidationErrors.add_note)(object, /) | Exception.add_note(note) -- add a note to the exception | |-----------------------------------------------------------------------------------------------------------------|---------------------------------------------------------------------------------| | [`derive`](#fiftyone.core.annotation.validate_label_schemas.ValidationErrors.derive)(object, /) | | | [`split`](#fiftyone.core.annotation.validate_label_schemas.ValidationErrors.split)(object, /) | | | [`subgroup`](#fiftyone.core.annotation.validate_label_schemas.ValidationErrors.subgroup)(object, /) | | | [`with_traceback`](#fiftyone.core.annotation.validate_label_schemas.ValidationErrors.with_traceback)(object, /) | Exception.with_traceback(tb) -- set self._\_traceback_\_ to tb and return self. | **Attributes:** | [`args`](#fiftyone.core.annotation.validate_label_schemas.ValidationErrors.args) | | |----------------------------------------------------------------------------------------------|-------------------| | [`exceptions`](#fiftyone.core.annotation.validate_label_schemas.ValidationErrors.exceptions) | nested exceptions | | [`message`](#fiftyone.core.annotation.validate_label_schemas.ValidationErrors.message) | exception message | #### add_note(object,) Exception.add_note(note) – add a note to the exception #### args #### derive(object,) #### exceptions nested exceptions #### message exception message #### split(object,) #### subgroup(object,) #### with_traceback(object,) Exception.with_traceback(tb) – set self._\_traceback_\_ to tb and return self. ### fiftyone.core.annotation.validate_label_schemas.validate_label_schemas(sample_collection, label_schema, allow_new_attrs=False, allow_new_fields=False, fields=None, \_allow_default=False) Validates label schemas for a [`fiftyone.core.collections.SampleCollection`](fiftyone.core.collections.md#fiftyone.core.collections.SampleCollection). See `generate_label_schemas()` for acceptable label schema specifications * **Parameters:** * **sample_collection** – the [`fiftyone.core.collections.SampleCollection`](fiftyone.core.collections.md#fiftyone.core.collections.SampleCollection) * **label_schema** – a label schemas `dict` or an individual field’s label schema `dict` if only one field is provided * **allow_new_attrs** (*False*) – whether to allow label attributes that do not yet exist on the [field schema](../user_guide/using_datasets.md#field-schemas) * **allow_new_fields** (*False*) – whether to allow label schemas for fields that do not yet exist on the [field schema](../user_guide/using_datasets.md#field-schemas) * **fields** (*None*) – a field name, `embedded.field.name` or iterable of such values * **Raises:** [**ValidationErrors**](#fiftyone.core.annotation.validate_label_schemas.ValidationErrors) – if the label schema(s) are invalid