Source from which this fact chunk was retrieved. If it was retrieved
from the GroundingFacts provided in the request then this field will
contain the index of the specific fact from which this chunk was
retrieved.
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Missing the information I need","missingTheInformationINeed","thumb-down"],["Too complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-07 UTC."],[[["\u003cp\u003eThis document provides reference documentation for the \u003ccode\u003eFactChunk\u003c/code\u003e class within the Google Cloud Discovery Engine v1 API.\u003c/p\u003e\n"],["\u003cp\u003eThe \u003ccode\u003eFactChunk\u003c/code\u003e class represents a chunk of factual information, implementing interfaces like \u003ccode\u003eIMessage\u003c/code\u003e, \u003ccode\u003eIEquatable\u003c/code\u003e, \u003ccode\u003eIDeepCloneable\u003c/code\u003e, and \u003ccode\u003eIBufferMessage\u003c/code\u003e.\u003c/p\u003e\n"],["\u003cp\u003eKey properties of \u003ccode\u003eFactChunk\u003c/code\u003e include \u003ccode\u003eChunkText\u003c/code\u003e (the content of the fact chunk), \u003ccode\u003eIndex\u003c/code\u003e (the chunk's index), \u003ccode\u003eSource\u003c/code\u003e (the source of the chunk), and \u003ccode\u003eSourceMetadata\u003c/code\u003e (detailed source information).\u003c/p\u003e\n"],["\u003cp\u003eThe document lists available versions of the API, with version 1.6.0 being the latest release.\u003c/p\u003e\n"],["\u003cp\u003eThere are two constructors, a parameterless constructor and one that takes a \u003ccode\u003eFactChunk\u003c/code\u003e object, which are used to instantiate \u003ccode\u003eFactChunk\u003c/code\u003e objects.\u003c/p\u003e\n"]]],[],null,["# Discovery Engine v1 API - Class FactChunk (1.9.0)\n\nVersion latestkeyboard_arrow_down\n\n- [1.9.0 (latest)](/dotnet/docs/reference/Google.Cloud.DiscoveryEngine.V1/latest/Google.Cloud.DiscoveryEngine.V1.FactChunk)\n- [1.8.0](/dotnet/docs/reference/Google.Cloud.DiscoveryEngine.V1/1.8.0/Google.Cloud.DiscoveryEngine.V1.FactChunk)\n- [1.7.0](/dotnet/docs/reference/Google.Cloud.DiscoveryEngine.V1/1.7.0/Google.Cloud.DiscoveryEngine.V1.FactChunk)\n- [1.6.0](/dotnet/docs/reference/Google.Cloud.DiscoveryEngine.V1/1.6.0/Google.Cloud.DiscoveryEngine.V1.FactChunk)\n- [1.5.0](/dotnet/docs/reference/Google.Cloud.DiscoveryEngine.V1/1.5.0/Google.Cloud.DiscoveryEngine.V1.FactChunk)\n- [1.4.0](/dotnet/docs/reference/Google.Cloud.DiscoveryEngine.V1/1.4.0/Google.Cloud.DiscoveryEngine.V1.FactChunk)\n- [1.3.0](/dotnet/docs/reference/Google.Cloud.DiscoveryEngine.V1/1.3.0/Google.Cloud.DiscoveryEngine.V1.FactChunk)\n- [1.2.0](/dotnet/docs/reference/Google.Cloud.DiscoveryEngine.V1/1.2.0/Google.Cloud.DiscoveryEngine.V1.FactChunk)\n- [1.1.0](/dotnet/docs/reference/Google.Cloud.DiscoveryEngine.V1/1.1.0/Google.Cloud.DiscoveryEngine.V1.FactChunk)\n- [1.0.0-beta06](/dotnet/docs/reference/Google.Cloud.DiscoveryEngine.V1/1.0.0-beta06/Google.Cloud.DiscoveryEngine.V1.FactChunk) \n\n public sealed class FactChunk : IMessage\u003cFactChunk\u003e, IEquatable\u003cFactChunk\u003e, IDeepCloneable\u003cFactChunk\u003e, IBufferMessage, IMessage\n\nReference documentation and code samples for the Discovery Engine v1 API class FactChunk.\n\nFact Chunk. \n\nInheritance\n-----------\n\n[object](https://learn.microsoft.com/dotnet/api/system.object) \\\u003e FactChunk \n\nImplements\n----------\n\n[IMessage](https://cloud.google.com/dotnet/docs/reference/Google.Protobuf/latest/Google.Protobuf.IMessage-1.html)[FactChunk](/dotnet/docs/reference/Google.Cloud.DiscoveryEngine.V1/latest/Google.Cloud.DiscoveryEngine.V1.FactChunk), [IEquatable](https://learn.microsoft.com/dotnet/api/system.iequatable-1)[FactChunk](/dotnet/docs/reference/Google.Cloud.DiscoveryEngine.V1/latest/Google.Cloud.DiscoveryEngine.V1.FactChunk), [IDeepCloneable](https://cloud.google.com/dotnet/docs/reference/Google.Protobuf/latest/Google.Protobuf.IDeepCloneable-1.html)[FactChunk](/dotnet/docs/reference/Google.Cloud.DiscoveryEngine.V1/latest/Google.Cloud.DiscoveryEngine.V1.FactChunk), [IBufferMessage](https://cloud.google.com/dotnet/docs/reference/Google.Protobuf/latest/Google.Protobuf.IBufferMessage.html), [IMessage](https://cloud.google.com/dotnet/docs/reference/Google.Protobuf/latest/Google.Protobuf.IMessage.html) \n\nInherited Members\n-----------------\n\n[object.GetHashCode()](https://learn.microsoft.com/dotnet/api/system.object.gethashcode) \n[object.GetType()](https://learn.microsoft.com/dotnet/api/system.object.gettype) \n[object.ToString()](https://learn.microsoft.com/dotnet/api/system.object.tostring)\n\nNamespace\n---------\n\n[Google.Cloud.DiscoveryEngine.V1](/dotnet/docs/reference/Google.Cloud.DiscoveryEngine.V1/latest/Google.Cloud.DiscoveryEngine.V1)\n\nAssembly\n--------\n\nGoogle.Cloud.DiscoveryEngine.V1.dll\n\nConstructors\n------------\n\n### FactChunk()\n\n public FactChunk()\n\n### FactChunk(FactChunk)\n\n public FactChunk(FactChunk other)\n\nProperties\n----------\n\n### ChunkText\n\n public string ChunkText { get; set; }\n\nText content of the fact chunk. Can be at most 10K characters long.\n\n### Domain\n\n public string Domain { get; set; }\n\nThe domain of the source.\n\n### Index\n\n public int Index { get; set; }\n\nThe index of this chunk. Currently, only used for the streaming mode.\n\n### Source\n\n public string Source { get; set; }\n\nSource from which this fact chunk was retrieved. If it was retrieved\nfrom the GroundingFacts provided in the request then this field will\ncontain the index of the specific fact from which this chunk was\nretrieved.\n\n### SourceMetadata\n\n public MapField\u003cstring, string\u003e SourceMetadata { get; }\n\nMore fine-grained information for the source reference.\n\n### Title\n\n public string Title { get; set; }\n\nThe title of the source.\n\n### Uri\n\n public string Uri { get; set; }\n\nThe URI of the source."]]
