public sealed class Document.Types.EntityRelation : IMessage<Document.Types.EntityRelation>, IEquatable<Document.Types.EntityRelation>, IDeepCloneable<Document.Types.EntityRelation>, IBufferMessage, IMessage
Reference documentation and code samples for the Cloud Document AI v1 API class Document.Types.EntityRelation.
Relationship between
[Entities][google.cloud.documentai.v1.Document.Entity].
[[["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complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-19 UTC."],[[["\u003cp\u003eThis webpage provides documentation for the \u003ccode\u003eDocument.Types.EntityRelation\u003c/code\u003e class within the Google Cloud Document AI v1 API, with the most recent version being 3.19.0.\u003c/p\u003e\n"],["\u003cp\u003eThe \u003ccode\u003eEntityRelation\u003c/code\u003e class represents the relationship between entities in a document, and can be accessed through an extensive list of version history.\u003c/p\u003e\n"],["\u003cp\u003eThe class implements several interfaces, including \u003ccode\u003eIMessage\u003c/code\u003e, \u003ccode\u003eIEquatable\u003c/code\u003e, \u003ccode\u003eIDeepCloneable\u003c/code\u003e, and \u003ccode\u003eIBufferMessage\u003c/code\u003e, showcasing its integration with Google's protocol buffer system and .NET's type system.\u003c/p\u003e\n"],["\u003cp\u003eThe \u003ccode\u003eEntityRelation\u003c/code\u003e class has three key properties, \u003ccode\u003eObjectId\u003c/code\u003e, \u003ccode\u003eRelation\u003c/code\u003e, and \u003ccode\u003eSubjectId\u003c/code\u003e, that are used to describe relationships between entities within a document.\u003c/p\u003e\n"]]],[],null,["# Cloud Document AI v1 API - Class Document.Types.EntityRelation (3.21.0)\n\nVersion latestkeyboard_arrow_down\n\n- [3.21.0 (latest)](/dotnet/docs/reference/Google.Cloud.DocumentAI.V1/latest/Google.Cloud.DocumentAI.V1.Document.Types.EntityRelation)\n- [3.20.0](/dotnet/docs/reference/Google.Cloud.DocumentAI.V1/3.20.0/Google.Cloud.DocumentAI.V1.Document.Types.EntityRelation)\n- [3.19.0](/dotnet/docs/reference/Google.Cloud.DocumentAI.V1/3.19.0/Google.Cloud.DocumentAI.V1.Document.Types.EntityRelation)\n- [3.18.0](/dotnet/docs/reference/Google.Cloud.DocumentAI.V1/3.18.0/Google.Cloud.DocumentAI.V1.Document.Types.EntityRelation)\n- [3.17.0](/dotnet/docs/reference/Google.Cloud.DocumentAI.V1/3.17.0/Google.Cloud.DocumentAI.V1.Document.Types.EntityRelation)\n- [3.16.0](/dotnet/docs/reference/Google.Cloud.DocumentAI.V1/3.16.0/Google.Cloud.DocumentAI.V1.Document.Types.EntityRelation)\n- [3.15.0](/dotnet/docs/reference/Google.Cloud.DocumentAI.V1/3.15.0/Google.Cloud.DocumentAI.V1.Document.Types.EntityRelation)\n- [3.14.0](/dotnet/docs/reference/Google.Cloud.DocumentAI.V1/3.14.0/Google.Cloud.DocumentAI.V1.Document.Types.EntityRelation)\n- [3.13.0](/dotnet/docs/reference/Google.Cloud.DocumentAI.V1/3.13.0/Google.Cloud.DocumentAI.V1.Document.Types.EntityRelation)\n- [3.12.0](/dotnet/docs/reference/Google.Cloud.DocumentAI.V1/3.12.0/Google.Cloud.DocumentAI.V1.Document.Types.EntityRelation)\n- [3.11.0](/dotnet/docs/reference/Google.Cloud.DocumentAI.V1/3.11.0/Google.Cloud.DocumentAI.V1.Document.Types.EntityRelation)\n- [3.10.0](/dotnet/docs/reference/Google.Cloud.DocumentAI.V1/3.10.0/Google.Cloud.DocumentAI.V1.Document.Types.EntityRelation)\n- [3.9.0](/dotnet/docs/reference/Google.Cloud.DocumentAI.V1/3.9.0/Google.Cloud.DocumentAI.V1.Document.Types.EntityRelation)\n- [3.8.0](/dotnet/docs/reference/Google.Cloud.DocumentAI.V1/3.8.0/Google.Cloud.DocumentAI.V1.Document.Types.EntityRelation)\n- [3.7.0](/dotnet/docs/reference/Google.Cloud.DocumentAI.V1/3.7.0/Google.Cloud.DocumentAI.V1.Document.Types.EntityRelation)\n- [3.6.0](/dotnet/docs/reference/Google.Cloud.DocumentAI.V1/3.6.0/Google.Cloud.DocumentAI.V1.Document.Types.EntityRelation)\n- [3.5.0](/dotnet/docs/reference/Google.Cloud.DocumentAI.V1/3.5.0/Google.Cloud.DocumentAI.V1.Document.Types.EntityRelation)\n- [3.4.0](/dotnet/docs/reference/Google.Cloud.DocumentAI.V1/3.4.0/Google.Cloud.DocumentAI.V1.Document.Types.EntityRelation)\n- [3.3.0](/dotnet/docs/reference/Google.Cloud.DocumentAI.V1/3.3.0/Google.Cloud.DocumentAI.V1.Document.Types.EntityRelation)\n- [3.2.0](/dotnet/docs/reference/Google.Cloud.DocumentAI.V1/3.2.0/Google.Cloud.DocumentAI.V1.Document.Types.EntityRelation)\n- [3.1.0](/dotnet/docs/reference/Google.Cloud.DocumentAI.V1/3.1.0/Google.Cloud.DocumentAI.V1.Document.Types.EntityRelation)\n- [3.0.0](/dotnet/docs/reference/Google.Cloud.DocumentAI.V1/3.0.0/Google.Cloud.DocumentAI.V1.Document.Types.EntityRelation)\n- [2.0.0](/dotnet/docs/reference/Google.Cloud.DocumentAI.V1/2.0.0/Google.Cloud.DocumentAI.V1.Document.Types.EntityRelation)\n- [1.5.0](/dotnet/docs/reference/Google.Cloud.DocumentAI.V1/1.5.0/Google.Cloud.DocumentAI.V1.Document.Types.EntityRelation)\n- [1.4.0](/dotnet/docs/reference/Google.Cloud.DocumentAI.V1/1.4.0/Google.Cloud.DocumentAI.V1.Document.Types.EntityRelation)\n- [1.3.0](/dotnet/docs/reference/Google.Cloud.DocumentAI.V1/1.3.0/Google.Cloud.DocumentAI.V1.Document.Types.EntityRelation)\n- [1.2.0](/dotnet/docs/reference/Google.Cloud.DocumentAI.V1/1.2.0/Google.Cloud.DocumentAI.V1.Document.Types.EntityRelation)\n- [1.1.0](/dotnet/docs/reference/Google.Cloud.DocumentAI.V1/1.1.0/Google.Cloud.DocumentAI.V1.Document.Types.EntityRelation)\n- [1.0.0](/dotnet/docs/reference/Google.Cloud.DocumentAI.V1/1.0.0/Google.Cloud.DocumentAI.V1.Document.Types.EntityRelation) \n\n public sealed class Document.Types.EntityRelation : IMessage\u003cDocument.Types.EntityRelation\u003e, IEquatable\u003cDocument.Types.EntityRelation\u003e, IDeepCloneable\u003cDocument.Types.EntityRelation\u003e, IBufferMessage, IMessage\n\nReference documentation and code samples for the Cloud Document AI v1 API class Document.Types.EntityRelation.\n\nRelationship between\n\\[Entities\\]\\[google.cloud.documentai.v1.Document.Entity\\]. \n\nInheritance\n-----------\n\n[object](https://learn.microsoft.com/dotnet/api/system.object) \\\u003e Document.Types.EntityRelation \n\nImplements\n----------\n\n[IMessage](https://cloud.google.com/dotnet/docs/reference/Google.Protobuf/latest/Google.Protobuf.IMessage-1.html)[Document](/dotnet/docs/reference/Google.Cloud.DocumentAI.V1/latest/Google.Cloud.DocumentAI.V1.Document)[Types](/dotnet/docs/reference/Google.Cloud.DocumentAI.V1/latest/Google.Cloud.DocumentAI.V1.Document.Types)[EntityRelation](/dotnet/docs/reference/Google.Cloud.DocumentAI.V1/latest/Google.Cloud.DocumentAI.V1.Document.Types.EntityRelation), [IEquatable](https://learn.microsoft.com/dotnet/api/system.iequatable-1)[Document](/dotnet/docs/reference/Google.Cloud.DocumentAI.V1/latest/Google.Cloud.DocumentAI.V1.Document)[Types](/dotnet/docs/reference/Google.Cloud.DocumentAI.V1/latest/Google.Cloud.DocumentAI.V1.Document.Types)[EntityRelation](/dotnet/docs/reference/Google.Cloud.DocumentAI.V1/latest/Google.Cloud.DocumentAI.V1.Document.Types.EntityRelation), [IDeepCloneable](https://cloud.google.com/dotnet/docs/reference/Google.Protobuf/latest/Google.Protobuf.IDeepCloneable-1.html)[Document](/dotnet/docs/reference/Google.Cloud.DocumentAI.V1/latest/Google.Cloud.DocumentAI.V1.Document)[Types](/dotnet/docs/reference/Google.Cloud.DocumentAI.V1/latest/Google.Cloud.DocumentAI.V1.Document.Types)[EntityRelation](/dotnet/docs/reference/Google.Cloud.DocumentAI.V1/latest/Google.Cloud.DocumentAI.V1.Document.Types.EntityRelation), [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.DocumentAI.V1](/dotnet/docs/reference/Google.Cloud.DocumentAI.V1/latest/Google.Cloud.DocumentAI.V1)\n\nAssembly\n--------\n\nGoogle.Cloud.DocumentAI.V1.dll\n\nConstructors\n------------\n\n### EntityRelation()\n\n public EntityRelation()\n\n### EntityRelation(EntityRelation)\n\n public EntityRelation(Document.Types.EntityRelation other)\n\nProperties\n----------\n\n### ObjectId\n\n public string ObjectId { get; set; }\n\nObject entity id.\n\n### Relation\n\n public string Relation { get; set; }\n\nRelationship description.\n\n### SubjectId\n\n public string SubjectId { get; set; }\n\nSubject entity id."]]
