# Utilities

- [Schema Service](/api-references/utilities/schema.md)
- [Schema Tutorial](/api-references/utilities/schema/schema.md)
- [API Reference](/api-references/utilities/schema/api-reference.md)
- [Schema](/api-references/utilities/schema/api-reference/schema.md)
- [Type](/api-references/utilities/schema/api-reference/type.md)
- [Reference](/api-references/utilities/schema/api-reference/reference.md)
- [Custom Schema Type](/api-references/utilities/schema/api-reference/custom-schema-type.md)
- [Custom Instance](/api-references/utilities/schema/api-reference/custom-instance.md)
- [Models](/api-references/utilities/schema/api-reference/models.md)
- [Sequential-id Service](/api-references/utilities/sequential-id.md)
- [Sequential-id Tutorial](/api-references/utilities/sequential-id/sequentialid.md)
- [API Reference](/api-references/utilities/sequential-id/api-reference.md)