> ## Documentation Index > Fetch the complete documentation index at: https://api.aodocs.com/llms.txt > Use this file to discover all available pages before exploring further. # Get library classid documentid attachmentid extension > Returns the OSS extension data (e.g. ADXREF, ADATTR) stored alongside an attachment. ## OpenAPI ````yaml /openapis/attachment.json get /library/{libraryId}/classId/{classId}/documentId/{documentId}/attachmentId/{attachmentId}/extension/{extensionType} openapi: 3.0.1 info: description: >- The AODocs REST API exposes most of the features of AODocs. It can be used to implement custom applications, third-party integration, bulk tools, or just to experiment with AODocs. version: '69.4' title: AODocs REST API servers: - url: https://aodocs.altirnao.com/api security: [] tags: - name: drawing description: Lets you list existing views, update views, create new views paths: /library/{libraryId}/classId/{classId}/documentId/{documentId}/attachmentId/{attachmentId}/extension/{extensionType}: get: tags: - drawing description: >- Returns the OSS extension data (e.g. ADXREF, ADATTR) stored alongside an attachment. operationId: drawing:v1.Drawing.getExtension parameters: - $ref: '#/components/parameters/domain_query_parameter' - $ref: '#/components/parameters/libraryId_path_parameter' - $ref: '#/components/parameters/classId_path_parameter' - $ref: '#/components/parameters/documentId_path_parameter' - name: attachmentId in: path description: The OSS object id of the attachment. required: true schema: type: string - name: extensionType in: path description: The extension type to retrieve (e.g. ADXREF, ADATTR). required: true schema: type: string - $ref: '#/components/parameters/securityCode_query_parameter' responses: '200': description: A ApiOssExtension response content: application/json: schema: $ref: '#/components/schemas/ApiOssExtension' security: - google_id_token-a99f12e0: - https://www.googleapis.com/auth/userinfo.email - google_id_token_legacy-a99f12e0: - https://www.googleapis.com/auth/userinfo.email components: parameters: domain_query_parameter: name: domain in: query description: The G Suite domain required: false schema: type: string libraryId_path_parameter: name: libraryId in: path description: The ID of the library required: true schema: type: string classId_path_parameter: name: classId in: path description: The ID of the document class required: true schema: type: string documentId_path_parameter: name: documentId in: path description: The ID of the document required: true schema: type: string securityCode_query_parameter: name: securityCode in: query description: The security code required: false schema: type: string schemas: ApiOssExtension: type: object properties: attributes: $ref: '#/components/schemas/AttributeExtractionResult' kind: type: string xrefs: $ref: '#/components/schemas/XrefExtractionResult' AttributeExtractionResult: type: object properties: blocks: type: array items: $ref: '#/components/schemas/BlockAttributes' classId: type: string customProperties: type: object additionalProperties: type: string documentId: type: string domainName: type: string drawingExtents: $ref: '#/components/schemas/DrawingExtents' error: type: object properties: code: type: string details: type: object additionalProperties: type: string message: type: string extractedAt: type: string file: $ref: '#/components/schemas/File' libraryId: type: string libraryType: type: string status: type: string version: type: string XrefExtractionResult: type: object properties: classId: type: string documentId: type: string domainName: type: string error: type: object properties: code: type: string details: type: object additionalProperties: type: string message: type: string extractedAt: type: string file: $ref: '#/components/schemas/File' libraryId: type: string libraryType: type: string status: type: string version: type: string xrefs: type: array items: $ref: '#/components/schemas/XrefInfo' BlockAttributes: type: object properties: attributes: type: array items: $ref: '#/components/schemas/AttributeEntry' blockName: type: string DrawingExtents: type: object properties: height: type: number format: double maxX: type: number format: double maxY: type: number format: double maxZ: type: number format: double minX: type: number format: double minY: type: number format: double minZ: type: number format: double width: type: number format: double File: type: object properties: id: type: string XrefInfo: type: object properties: name: type: string originalPath: type: string resolved: type: boolean AttributeEntry: type: object properties: boundingBox: $ref: '#/components/schemas/BoundingBox' position: $ref: '#/components/schemas/Position' rotation: type: number format: double tag: type: string textHeight: type: number format: double type: type: string enum: - STRING - INTEGER - DOUBLE - DATE value: type: string widthFactor: type: number format: double BoundingBox: type: object properties: height: type: number format: double maxX: type: number format: double maxY: type: number format: double minX: type: number format: double minY: type: number format: double width: type: number format: double Position: type: object properties: x: type: number format: double 'y': type: number format: double z: type: number format: double securitySchemes: google_id_token-a99f12e0: type: oauth2 x-google-issuer: https://accounts.google.com x-google-jwks_uri: https://www.googleapis.com/oauth2/v1/certs x-google-audiences: >- 755040865326-h5gomu85549lkh2qf9d3lku39vnaf6ii.apps.googleusercontent.com,563231141203-231sn7f6ptedncun5h00h7ktbe3o2nd5.apps.googleusercontent.com,993707107224.apps.googleusercontent.com,ao-docs,aodocs-core-eu-1,ao-docs-staging,ao-docs-dev,aodocs-core-dev-us,aodocs-total-poc-euw3 flows: implicit: authorizationUrl: https://accounts.google.com/o/oauth2/v2/auth scopes: https://www.googleapis.com/auth/userinfo.email: View your email address google_id_token_legacy-a99f12e0: type: oauth2 x-google-issuer: accounts.google.com x-google-jwks_uri: https://www.googleapis.com/oauth2/v1/certs x-google-audiences: >- 755040865326-h5gomu85549lkh2qf9d3lku39vnaf6ii.apps.googleusercontent.com,563231141203-231sn7f6ptedncun5h00h7ktbe3o2nd5.apps.googleusercontent.com,993707107224.apps.googleusercontent.com,ao-docs,aodocs-core-eu-1,ao-docs-staging,ao-docs-dev,aodocs-core-dev-us,aodocs-total-poc-euw3 flows: implicit: authorizationUrl: https://accounts.google.com/o/oauth2/v2/auth scopes: https://www.googleapis.com/auth/userinfo.email: View your email address ````