> ## Documentation Index > Fetch the complete documentation index at: https://docs.ndi.nace.ai/llms.txt > Use this file to discover all available pages before exploring further. # generate_domain > Draft a taxonomy and ontology from a domain description. Cost class: slow. Synchronous and **non-persisting**: the model proposes vocabularies the author edits, then posts to ``POST /v1/domains``. Nothing is written to the database and no job is created. Kept off MCP because authoring is a reviewed human act, not an agent-loop step. ## OpenAPI ````yaml /openapi.json post /v1/domains/generate openapi: 3.1.0 info: description: >- Document intelligence: parse, split, classify, extract, and ground files, or build a searchable workspace. Authenticate with ``X-API-Key``. title: NDI Platform API version: 0.1.0 servers: - url: https://ndi-api.nace.ai security: [] tags: [] paths: /v1/domains/generate: post: tags: - domains summary: generate_domain description: >- Draft a taxonomy and ontology from a domain description. Cost class: slow. Synchronous and **non-persisting**: the model proposes vocabularies the author edits, then posts to ``POST /v1/domains``. Nothing is written to the database and no job is created. Kept off MCP because authoring is a reviewed human act, not an agent-loop step. operationId: generate_domain_v1_domains_generate_post requestBody: content: application/json: schema: $ref: '#/components/schemas/GenerateDomainRequest' required: true responses: '200': content: application/json: schema: $ref: '#/components/schemas/GenerateDomainResponse' description: Successful Response '504': content: application/json: schema: $ref: '#/components/schemas/ErrorEnvelope' description: Gateway Timeout default: content: application/json: example: error: code: invalid_request detail: null message: >- Request body has extra fields that this operation does not accept. request_id: req-01j9k2n3p4q5r6s7t8v9 retryable: false schema: $ref: '#/components/schemas/ErrorEnvelope' description: >- Typed error envelope used by every 4xx and 5xx. ``error.code`` distinguishes the failure; HTTP status is a consequence of the code. security: - APIKeyHeader: [] components: schemas: GenerateDomainRequest: additionalProperties: false description: |- Ask the model for an unsaved taxonomy + ontology draft. Nothing is persisted: the caller edits the draft, then posts it to ``POST /v1/domains``. Optional ``display_name`` / ``slug`` only seed the suggested identity fields returned alongside the vocabularies. properties: description: description: >- What kinds of files belong in this domain — the classifier-facing brief. maxLength: 4000 minLength: 1 title: Description type: string display_name: anyOf: - maxLength: 200 minLength: 1 type: string - type: 'null' description: Optional name hint used when suggesting a display name and slug. title: Display Name slug: anyOf: - maxLength: 64 pattern: ^[a-z0-9]+(?:_[a-z0-9]+)*$ type: string - type: 'null' description: >- Optional slug hint. When omitted, one is derived from the display name or description. title: Slug required: - description title: GenerateDomainRequest type: object GenerateDomainResponse: additionalProperties: false description: An unsaved draft ready for the authoring UI to edit and then create. properties: ontology: $ref: '#/components/schemas/Ontology' suggested_display_name: maxLength: 200 minLength: 1 title: Suggested Display Name type: string suggested_slug: maxLength: 64 pattern: ^[a-z0-9]+(?:_[a-z0-9]+)*$ title: Suggested Slug type: string taxonomy: $ref: '#/components/schemas/Taxonomy-Output' validation: $ref: '#/components/schemas/DomainValidation' description: >- Publish-gate check on the normalized draft — always run so the UI knows it can create cleanly. required: - taxonomy - ontology - suggested_slug - suggested_display_name - validation title: GenerateDomainResponse type: object ErrorEnvelope: description: Every non-2xx body on ``/v1``. example: error: code: invalid_request detail: null message: Request body has extra fields that this operation does not accept. request_id: req-01j9k2n3p4q5r6s7t8v9 retryable: false properties: error: $ref: '#/components/schemas/Error' required: - error title: ErrorEnvelope type: object Ontology: additionalProperties: false description: >- The graph shape. Closed node and edge types with declared domain/range. ``allow_other`` is the ontology's counterpart to :attr:`Taxonomy.allow_other`, and unlike it, this one *can* be turned off: a file must always be classifiable, but an entity need not always be extractable. properties: allow_other: default: false description: >- Offer the extractor the fallback entity type ('Other') and fallback relation ('RELATES_TO'). Set false to extract only what this ontology defines: the extraction prompt then lists neither, so a corpus stops paying for an open-ended tail of untyped nodes and edges. Files are unaffected — an unclassifiable one is still 'OtherDocument'. title: Allow Other type: boolean edge_types: items: $ref: '#/components/schemas/EdgeType' maxItems: 200 title: Edge Types type: array node_types: items: $ref: '#/components/schemas/NodeType' maxItems: 120 title: Node Types type: array title: Ontology type: object Taxonomy-Output: additionalProperties: false description: The classification vocabulary. properties: allow_other: const: true default: true description: >- Cannot be disabled: a document that fits nothing is labelled 'other', never force-fitted. title: Allow Other type: boolean classes: items: $ref: '#/components/schemas/TaxonomyClass' maxItems: 400 title: Classes type: array title: Taxonomy type: object DomainValidation: additionalProperties: false description: >- Returned on every domain write, so a caller never has to guess whether a publish will succeed. properties: effective_class_count: title: Effective Class Count type: integer effective_edge_type_count: title: Effective Edge Type Count type: integer effective_node_type_count: title: Effective Node Type Count type: integer errors: items: $ref: '#/components/schemas/DomainValidationError' title: Errors type: array valid: title: Valid type: boolean required: - valid - effective_class_count - effective_node_type_count - effective_edge_type_count title: DomainValidation type: object Error: description: The error object, per spec 12 §1.8. properties: code: $ref: '#/components/schemas/ErrorCode' detail: anyOf: - additionalProperties: true type: object - type: 'null' description: Structured payload, when the code carries one. title: Detail message: description: Human- and model-readable; says what to do differently. title: Message type: string request_id: description: Per-request correlation id; matches the ``X-Request-Id`` header. title: Request Id type: string retryable: description: Whether retrying the identical request could succeed. title: Retryable type: boolean required: - code - message - retryable - request_id title: Error type: object EdgeType: additionalProperties: false properties: description: title: Description type: string from_types: items: type: string minItems: 1 title: From Types type: array name: title: Name type: string property_hints: description: Suggested open-property keys carried on the edge. items: type: string title: Property Hints type: array to_types: items: type: string minItems: 1 title: To Types type: array required: - name - from_types - to_types - description title: EdgeType type: object NodeType: additionalProperties: false properties: description: title: Description type: string identifier_hints: description: >- The subset of property_hints that carry a hard identifier (tax_id, account_no, ...); entity resolution treats a shared value on one of these as strong merge evidence. items: type: string title: Identifier Hints type: array name: title: Name type: string property_hints: description: >- Suggested open-property keys the extractor should look for on this type. items: type: string title: Property Hints type: array tier: maximum: 5 minimum: 1 title: Tier type: integer required: - name - tier - description title: NodeType type: object TaxonomyClass: additionalProperties: false description: >- One leaf of the two-level taxonomy. The two levels are ``group`` then ``subgroup`` — exactly two, which is what makes a folder path predictable and a classification prompt short enough to be accurate. properties: aliases: description: Renames land here so old folder paths stay resolvable. items: type: string title: Aliases type: array description: description: Written for the classifier — it IS the prompt. title: Description type: string document_type: description: The Tier-2 ontology type it maps to (rule R0). title: Document Type type: string group: maxLength: 64 pattern: ^[a-z0-9]+(?:_[a-z0-9]+)*$ title: Group type: string subgroup: maxLength: 64 pattern: ^[a-z0-9]+(?:_[a-z0-9]+)*$ title: Subgroup type: string required: - group - subgroup - description - document_type title: TaxonomyClass type: object DomainValidationError: additionalProperties: false properties: code: title: Code type: string message: title: Message type: string path: title: Path type: string required: - code - path - message title: DomainValidationError type: object ErrorCode: description: |- Every error the ``/v1`` surface can return. Clients must treat this as an **open** enum: a new member is an additive change (spec 12 §9), and a client that crashes on an unknown code makes every future error a breaking change. enum: - invalid_request - unsupported_file_type - file_too_large - invalid_schema - invalid_sql - invalid_path_prefix - command_not_permitted - batch_too_large - domain_validation_failed - default_label_required - wait_required_for_zero_retention - workspace_not_found - file_not_found - job_not_found - upload_not_found - node_not_found - schema_not_found - domain_not_found - session_not_found - access_label_not_found - path_conflict - schema_version_conflict - access_label_name_taken - workspace_name_taken - access_label_in_use - upload_expired - file_not_ingested - workspace_deleting - workspace_not_deletable - ingestion_in_progress - job_not_cancellable - confirmation_required - domain_not_published - domain_in_use - reserved_domain_slug - kg_not_built - kg_build_in_progress - session_busy - range_not_satisfiable - result_expired - access_denied - access_backstop_violation - access_mode_not_implemented - rate_limited - concurrency_limit_reached - quota_exceeded - corrupt_file - zero_byte_file - encrypted_file - parse_failed - ocr_failed - conversion_failed - sheetless_workbook - unplayable_media - unclassified_pages - job_cancelled - job_timeout - upstream_unavailable - internal_error - unauthorized - not_implemented title: ErrorCode type: string securitySchemes: APIKeyHeader: in: header name: X-API-Key type: apiKey ````