diff --git a/src/Squidex.Domain.Apps.Entities/Contents/ContentGrain.cs b/src/Squidex.Domain.Apps.Entities/Contents/ContentGrain.cs
index 000314ccb..755e30a1d 100644
--- a/src/Squidex.Domain.Apps.Entities/Contents/ContentGrain.cs
+++ b/src/Squidex.Domain.Apps.Entities/Contents/ContentGrain.cs
@@ -61,17 +61,17 @@ namespace Squidex.Domain.Apps.Entities.Contents
                 case CreateContent createContent:
                     return CreateReturnAsync(createContent, async c =>
                     {
-                        GuardContent.CanCreate(c);
+                        var ctx = await CreateContext(c.AppId.Id, c.SchemaId.Id, () => "Failed to create content.");
 
-                        var operationContext = await CreateContext(c.AppId.Id, c.SchemaId.Id, () => "Failed to create content.");
+                        GuardContent.CanCreate(ctx.Schema, c);
 
-                        await operationContext.ExecuteScriptAndTransformAsync(x => x.ScriptCreate, "Create", c, c.Data, null);
-                        await operationContext.EnrichAsync(c.Data);
-                        await operationContext.ValidateAsync(c.Data);
+                        await ctx.ExecuteScriptAndTransformAsync(x => x.ScriptCreate, "Create", c, c.Data, null);
+                        await ctx.EnrichAsync(c.Data);
+                        await ctx.ValidateAsync(c.Data);
 
                         if (c.Publish)
                         {
-                            await operationContext.ExecuteScriptAsync(x => x.ScriptChange, "Published", c, c.Data, null);
+                            await ctx.ExecuteScriptAsync(x => x.ScriptChange, "Published", c, c.Data, null);
                         }
 
                         Create(c);
@@ -100,7 +100,9 @@ namespace Squidex.Domain.Apps.Entities.Contents
                     {
                         try
                         {
-                            GuardContent.CanChangeContentStatus(Snapshot.IsPending, Snapshot.Status, c);
+                            var ctx = await CreateContext(Snapshot.AppId.Id, Snapshot.SchemaId.Id, () => "Failed to change content.");
+
+                            GuardContent.CanChangeContentStatus(ctx.Schema, Snapshot.IsPending, Snapshot.Status, c);
 
                             if (c.DueTime.HasValue)
                             {
@@ -114,8 +116,6 @@ namespace Squidex.Domain.Apps.Entities.Contents
                                 }
                                 else
                                 {
-                                    var ctx = await CreateContext(Snapshot.AppId.Id, Snapshot.SchemaId.Id, () => "Failed to change content.");
-
                                     await ctx.ExecuteScriptAsync(x => x.ScriptChange, c.Status, c, Snapshot.Data);
 
                                     ChangeStatus(c);
@@ -138,11 +138,11 @@ namespace Squidex.Domain.Apps.Entities.Contents
                 case DeleteContent deleteContent:
                     return UpdateAsync(deleteContent, async c =>
                     {
-                        GuardContent.CanDelete(c);
+                        var ctx = await CreateContext(Snapshot.AppId.Id, Snapshot.SchemaId.Id, () => "Failed to delete content.");
 
-                        var operationContext = await CreateContext(Snapshot.AppId.Id, Snapshot.SchemaId.Id, () => "Failed to delete content.");
+                        GuardContent.CanDelete(ctx.Schema, c);
 
-                        await operationContext.ExecuteScriptAsync(x => x.ScriptDelete, "Delete", c, Snapshot.Data);
+                        await ctx.ExecuteScriptAsync(x => x.ScriptDelete, "Delete", c, Snapshot.Data);
 
                         Delete(c);
                     });
diff --git a/src/Squidex.Domain.Apps.Entities/Contents/ContentOperationContext.cs b/src/Squidex.Domain.Apps.Entities/Contents/ContentOperationContext.cs
index 5b1bc9474..97e729321 100644
--- a/src/Squidex.Domain.Apps.Entities/Contents/ContentOperationContext.cs
+++ b/src/Squidex.Domain.Apps.Entities/Contents/ContentOperationContext.cs
@@ -31,6 +31,11 @@ namespace Squidex.Domain.Apps.Entities.Contents
         private IAppEntity appEntity;
         private Func<string> message;
 
+        public ISchemaEntity Schema
+        {
+            get { return schemaEntity; }
+        }
+
         public static async Task<ContentOperationContext> CreateAsync(
             Guid appId,
             Guid schemaId,
diff --git a/src/Squidex.Domain.Apps.Entities/Contents/ContentQueryService.cs b/src/Squidex.Domain.Apps.Entities/Contents/ContentQueryService.cs
index f2602ccbc..5bcb4c004 100644
--- a/src/Squidex.Domain.Apps.Entities/Contents/ContentQueryService.cs
+++ b/src/Squidex.Domain.Apps.Entities/Contents/ContentQueryService.cs
@@ -63,7 +63,6 @@ namespace Squidex.Domain.Apps.Entities.Contents
         public async Task<IContentEntity> FindContentAsync(QueryContext context, Guid id, long version = -1)
         {
             Guard.NotNull(context, nameof(context));
-            Guard.NotEmpty(id, nameof(id));
 
             var schema = await GetSchemaAsync(context);
 
diff --git a/src/Squidex.Domain.Apps.Entities/Contents/Guards/GuardContent.cs b/src/Squidex.Domain.Apps.Entities/Contents/Guards/GuardContent.cs
index 8f5e4d1b8..8c02f6d88 100644
--- a/src/Squidex.Domain.Apps.Entities/Contents/Guards/GuardContent.cs
+++ b/src/Squidex.Domain.Apps.Entities/Contents/Guards/GuardContent.cs
@@ -5,16 +5,18 @@
 //  All rights reserved. Licensed under the MIT license.
 // ==========================================================================
 
+using System;
 using NodaTime;
 using Squidex.Domain.Apps.Core.Contents;
 using Squidex.Domain.Apps.Entities.Contents.Commands;
+using Squidex.Domain.Apps.Entities.Schemas;
 using Squidex.Infrastructure;
 
 namespace Squidex.Domain.Apps.Entities.Contents.Guards
 {
     public static class GuardContent
     {
-        public static void CanCreate(CreateContent command)
+        public static void CanCreate(ISchemaEntity schema, CreateContent command)
         {
             Guard.NotNull(command, nameof(command));
 
@@ -22,6 +24,11 @@ namespace Squidex.Domain.Apps.Entities.Contents.Guards
             {
                 ValidateData(command, e);
             });
+
+            if (schema.IsSingleton && command.ContentId != Guid.Empty)
+            {
+                throw new DomainException("Singleton content cannot be created.");
+            }
         }
 
         public static void CanUpdate(UpdateContent command)
@@ -54,10 +61,15 @@ namespace Squidex.Domain.Apps.Entities.Contents.Guards
             }
         }
 
-        public static void CanChangeContentStatus(bool isPending, Status status, ChangeContentStatus command)
+        public static void CanChangeContentStatus(ISchemaEntity schema, bool isPending, Status status, ChangeContentStatus command)
         {
             Guard.NotNull(command, nameof(command));
 
+            if (schema.IsSingleton && command.Status != Status.Published)
+            {
+                throw new DomainException("Singleton content archived or unpublished.");
+            }
+
             Validate.It(() => "Cannot change status.", e =>
             {
                 if (!StatusFlow.Exists(command.Status))
@@ -86,9 +98,14 @@ namespace Squidex.Domain.Apps.Entities.Contents.Guards
             });
         }
 
-        public static void CanDelete(DeleteContent command)
+        public static void CanDelete(ISchemaEntity schema, DeleteContent command)
         {
             Guard.NotNull(command, nameof(command));
+
+            if (schema.IsSingleton)
+            {
+                throw new DomainException("Singleton content cannot be deleted.");
+            }
         }
 
         private static void ValidateData(ContentDataCommand command, AddValidation e)
diff --git a/src/Squidex.Domain.Apps.Entities/Contents/SingletonCommandMiddleware.cs b/src/Squidex.Domain.Apps.Entities/Contents/SingletonCommandMiddleware.cs
new file mode 100644
index 000000000..6dd070600
--- /dev/null
+++ b/src/Squidex.Domain.Apps.Entities/Contents/SingletonCommandMiddleware.cs
@@ -0,0 +1,42 @@
+// ==========================================================================
+//  Squidex Headless CMS
+// ==========================================================================
+//  Copyright (c) Squidex UG (haftungsbeschraenkt)
+//  All rights reserved. Licensed under the MIT license.
+// ==========================================================================
+
+using System;
+using System.Threading.Tasks;
+using Squidex.Domain.Apps.Core.Contents;
+using Squidex.Domain.Apps.Entities.Contents.Commands;
+using Squidex.Domain.Apps.Entities.Schemas.Commands;
+using Squidex.Infrastructure;
+using Squidex.Infrastructure.Commands;
+using Squidex.Infrastructure.Reflection;
+
+namespace Squidex.Domain.Apps.Entities.Contents
+{
+    public sealed class SingletonCommandMiddleware : ICommandMiddleware
+    {
+        public async Task HandleAsync(CommandContext context, Func<Task> next)
+        {
+            await next();
+
+            if (context.IsCompleted &&
+                context.Command is CreateSchema createSchema &&
+                createSchema.Singleton)
+            {
+                var schemaId = new NamedId<Guid>(createSchema.SchemaId, createSchema.Name);
+
+                var data = new NamedContentData();
+
+                var contentId = Guid.Empty;
+                var content = new CreateContent { Data = data, ContentId = contentId, SchemaId = schemaId, Publish = true };
+
+                SimpleMapper.Map(context.Command, content);
+
+                await context.CommandBus.PublishAsync(content);
+            }
+        }
+    }
+}
diff --git a/src/Squidex.Domain.Apps.Entities/Schemas/Commands/CreateSchema.cs b/src/Squidex.Domain.Apps.Entities/Schemas/Commands/CreateSchema.cs
index 923499e79..9c39fa5a9 100644
--- a/src/Squidex.Domain.Apps.Entities/Schemas/Commands/CreateSchema.cs
+++ b/src/Squidex.Domain.Apps.Entities/Schemas/Commands/CreateSchema.cs
@@ -22,6 +22,8 @@ namespace Squidex.Domain.Apps.Entities.Schemas.Commands
 
         public SchemaProperties Properties { get; set; }
 
+        public bool Singleton { get; set; }
+
         public bool Publish { get; set; }
 
         public CreateSchema()
diff --git a/src/Squidex.Domain.Apps.Entities/Schemas/ISchemaEntity.cs b/src/Squidex.Domain.Apps.Entities/Schemas/ISchemaEntity.cs
index 335a91e92..98913f9e3 100644
--- a/src/Squidex.Domain.Apps.Entities/Schemas/ISchemaEntity.cs
+++ b/src/Squidex.Domain.Apps.Entities/Schemas/ISchemaEntity.cs
@@ -23,6 +23,8 @@ namespace Squidex.Domain.Apps.Entities.Schemas
 
         string Category { get; }
 
+        bool IsSingleton { get; }
+
         bool IsPublished { get; }
 
         bool IsDeleted { get; }
diff --git a/src/Squidex.Domain.Apps.Entities/Schemas/State/SchemaState.cs b/src/Squidex.Domain.Apps.Entities/Schemas/State/SchemaState.cs
index 4a787d912..01bd7a7d1 100644
--- a/src/Squidex.Domain.Apps.Entities/Schemas/State/SchemaState.cs
+++ b/src/Squidex.Domain.Apps.Entities/Schemas/State/SchemaState.cs
@@ -37,6 +37,9 @@ namespace Squidex.Domain.Apps.Entities.Schemas.State
         [JsonProperty]
         public bool IsDeleted { get; set; }
 
+        [JsonProperty]
+        public bool IsSingleton { get; set; }
+
         [JsonProperty]
         public string ScriptQuery { get; set; }
 
@@ -65,6 +68,8 @@ namespace Squidex.Domain.Apps.Entities.Schemas.State
         {
             Name = @event.Name;
 
+            IsSingleton = @event.Singleton;
+
             var schema = new Schema(@event.Name);
 
             if (@event.Properties != null)
diff --git a/src/Squidex.Domain.Apps.Events/Schemas/SchemaCreated.cs b/src/Squidex.Domain.Apps.Events/Schemas/SchemaCreated.cs
index 2e7c6ec2b..6f4f24295 100644
--- a/src/Squidex.Domain.Apps.Events/Schemas/SchemaCreated.cs
+++ b/src/Squidex.Domain.Apps.Events/Schemas/SchemaCreated.cs
@@ -20,6 +20,8 @@ namespace Squidex.Domain.Apps.Events.Schemas
 
         public SchemaProperties Properties { get; set; }
 
+        public bool Singleton { get; set; }
+
         public bool Publish { get; set; }
     }
 }
diff --git a/src/Squidex.Infrastructure/States/Store.cs b/src/Squidex.Infrastructure/States/Store.cs
index 461c443fb..89e162a54 100644
--- a/src/Squidex.Infrastructure/States/Store.cs
+++ b/src/Squidex.Infrastructure/States/Store.cs
@@ -42,7 +42,7 @@ namespace Squidex.Infrastructure.States
 
         public IPersistence WithEventSourcing(Type owner, TKey key, Func<Envelope<IEvent>, Task> applyEvent)
         {
-            Guard.NotDefault(key, nameof(key));
+            Guard.NotNull(key, nameof(key));
 
             var snapshotStore = (ISnapshotStore<object, TKey>)services.GetService(typeof(ISnapshotStore<object, TKey>));
 
@@ -51,7 +51,7 @@ namespace Squidex.Infrastructure.States
 
         private IPersistence<TState> CreatePersistence<TState>(Type owner, TKey key, PersistenceMode mode, Func<TState, Task> applySnapshot, Func<Envelope<IEvent>, Task> applyEvent)
         {
-            Guard.NotDefault(key, nameof(key));
+            Guard.NotNull(key, nameof(key));
 
             var snapshotStore = (ISnapshotStore<TState, TKey>)services.GetService(typeof(ISnapshotStore<TState, TKey>));
 
diff --git a/src/Squidex/Areas/Api/Controllers/Schemas/Models/CreateSchemaDto.cs b/src/Squidex/Areas/Api/Controllers/Schemas/Models/CreateSchemaDto.cs
index b8109375f..922647abc 100644
--- a/src/Squidex/Areas/Api/Controllers/Schemas/Models/CreateSchemaDto.cs
+++ b/src/Squidex/Areas/Api/Controllers/Schemas/Models/CreateSchemaDto.cs
@@ -32,6 +32,11 @@ namespace Squidex.Areas.Api.Controllers.Schemas.Models
         /// </summary>
         public List<CreateSchemaFieldDto> Fields { get; set; }
 
+        /// <summary>
+        /// Set to true to allow a single content item only.
+        /// </summary>
+        public bool Singleton { get; set; }
+
         /// <summary>
         /// Set it to true to autopublish the schema.
         /// </summary>
diff --git a/src/Squidex/Areas/Api/Controllers/Schemas/Models/SchemaDetailsDto.cs b/src/Squidex/Areas/Api/Controllers/Schemas/Models/SchemaDetailsDto.cs
index 850c6f938..c9c3c5909 100644
--- a/src/Squidex/Areas/Api/Controllers/Schemas/Models/SchemaDetailsDto.cs
+++ b/src/Squidex/Areas/Api/Controllers/Schemas/Models/SchemaDetailsDto.cs
@@ -36,6 +36,11 @@ namespace Squidex.Areas.Api.Controllers.Schemas.Models
         /// </summary>
         public string Category { get; set; }
 
+        /// <summary>
+        /// Indicates if the schema is a singleton.
+        /// </summary>
+        public bool IsSingleton { get; set; }
+
         /// <summary>
         /// Indicates if the schema is published.
         /// </summary>
diff --git a/src/Squidex/Areas/Api/Controllers/Schemas/Models/SchemaDto.cs b/src/Squidex/Areas/Api/Controllers/Schemas/Models/SchemaDto.cs
index 0c0869ede..370d6a91d 100644
--- a/src/Squidex/Areas/Api/Controllers/Schemas/Models/SchemaDto.cs
+++ b/src/Squidex/Areas/Api/Controllers/Schemas/Models/SchemaDto.cs
@@ -39,6 +39,11 @@ namespace Squidex.Areas.Api.Controllers.Schemas.Models
         [Required]
         public SchemaPropertiesDto Properties { get; set; }
 
+        /// <summary>
+        /// Indicates if the schema is a singleton.
+        /// </summary>
+        public bool IsSingleton { get; set; }
+
         /// <summary>
         /// Indicates if the schema is published.
         /// </summary>
diff --git a/src/Squidex/Config/Domain/EntitiesServices.cs b/src/Squidex/Config/Domain/EntitiesServices.cs
index ab8132503..140a66cc6 100644
--- a/src/Squidex/Config/Domain/EntitiesServices.cs
+++ b/src/Squidex/Config/Domain/EntitiesServices.cs
@@ -128,6 +128,9 @@ namespace Squidex.Config.Domain
             services.AddSingletonAs<SchemasByAppIndexCommandMiddleware>()
                 .As<ICommandMiddleware>();
 
+            services.AddSingletonAs<SingletonCommandMiddleware>()
+                .As<ICommandMiddleware>();
+
             services.AddSingletonAs<CreateBlogCommandMiddleware>()
                 .As<ICommandMiddleware>();
 
diff --git a/src/Squidex/app/features/content/pages/content/content-page.component.html b/src/Squidex/app/features/content/pages/content/content-page.component.html
index d6442b2a9..cdf90089e 100644
--- a/src/Squidex/app/features/content/pages/content/content-page.component.html
+++ b/src/Squidex/app/features/content/pages/content/content-page.component.html
@@ -3,7 +3,7 @@
 <form [formGroup]="contentForm.form" (ngSubmit)="saveAndPublish()">
     <sqx-panel desiredWidth="*" [showSidebar]="content">
         <ng-container title>
-            <a class="btn btn-link" (click)="back()">
+            <a class="btn btn-link" (click)="back()" *ngIf="!schema.isSingleton">
                 <i class="icon-angle-left"></i>
             </a>
 
@@ -32,7 +32,8 @@
             </ng-container>
             <ng-template #notNew>
                 <div class="dropdown dropdown-options ml-1" *ngIf="content">
-                    <button type="button" class="btn btn-outline-secondary" (click)="dropdown.toggle()" [class.active]="dropdown.isOpen | async" #optionsButton>
+                    <button type="button" class="btn btn-outline-secondary" (click)="dropdown.toggle()" [disabled]="schema.isSingleton && !content.isPending" 
+                        [class.active]="dropdown.isOpen | async" #optionsButton>
                         <sqx-content-status 
                             [status]="content.status"
                             [scheduledTo]="content.scheduleJob?.status"
@@ -42,42 +43,47 @@
                         </sqx-content-status>
                     </button>
 
-                    <div class="dropdown-menu" *sqxModalView="dropdown" [sqxModalTarget]="optionsButton" @fade>
-                        <ng-container *ngIf="content.isPending">
-                            <a class="dropdown-item" (click)="discardChanges()">
-                                Discard changes
-                            </a>
-
-                            <div class="dropdown-divider"></div>
-                            
-                            <a class="dropdown-item" (click)="publishChanges()">
-                                Publish changes
-                            </a>
-                        </ng-container>
-
-                        <a class="dropdown-item" (click)="publish()" *ngIf="content.status === 'Draft'">
-                            Publish
-                        </a>
-                        <a class="dropdown-item" (click)="unpublish()" *ngIf="content.status === 'Published'">
-                            Unpublish
-                        </a>
-                        <a class="dropdown-item" (click)="archive()" *ngIf="content.status !== 'Archived'">
-                            Archive
-                        </a>
-                        <a class="dropdown-item" (click)="restore()" *ngIf="content.status === 'Archived'">
-                            Restore
-                        </a>
-
-                        <div class="dropdown-divider"></div>
-
-                        <a class="dropdown-item dropdown-item-delete"
-                            (sqxConfirmClick)="delete()"
-                            confirmTitle="Delete content" 
-                            confirmText="Do you really want to delete the content?">
-                            Delete
-                        </a>
-                    </div>
-                </div>        
+                    <ng-container *ngIf="content.isPending || !schema.isSingleton">
+                        <div class="dropdown-menu" *sqxModalView="dropdown" [sqxModalTarget]="optionsButton" @fade>
+                            <ng-container *ngIf="content.isPending">
+                                <a class="dropdown-item" (click)="discardChanges()">
+                                    Discard changes
+                                </a>
+
+                                <div class="dropdown-divider"></div>
+                                
+                                <a class="dropdown-item" (click)="publishChanges()">
+                                    Publish changes
+                                </a>
+                            </ng-container>
+
+                            <ng-container *ngIf="!schema.isSingleton">
+                                <a class="dropdown-item" (click)="publish()" *ngIf="content.status === 'Draft'">
+                                    Publish
+                                </a>
+                                <a class="dropdown-item" (click)="unpublish()" *ngIf="content.status === 'Published'">
+                                    Unpublish
+                                </a>
+                                <a class="dropdown-item" (click)="archive()" *ngIf="content.status !== 'Archived'">
+                                    Archive
+                                </a>
+                                <a class="dropdown-item" (click)="restore()" *ngIf="content.status === 'Archived'">
+                                    Restore
+                                </a>
+
+                                <div class="dropdown-divider"></div>
+
+                                <a class="dropdown-item dropdown-item-delete"
+                                    (sqxConfirmClick)="delete()"
+                                    confirmTitle="Delete content" 
+                                    confirmText="Do you really want to delete the content?">
+                                    Delete
+                                </a>
+                            </ng-container>
+                        </div>
+                    </ng-container>
+                </div>
+                
 
                 <ng-container *ngIf="content.status !== 'Archived'">
                     <button type="button" class="btn btn-secondary ml-1" (click)="saveAsProposal()" *ngIf="content.status === 'Published'">
diff --git a/src/Squidex/app/features/schemas/pages/schemas/schema-form.component.html b/src/Squidex/app/features/schemas/pages/schemas/schema-form.component.html
index a1f03b011..01663b8f4 100644
--- a/src/Squidex/app/features/schemas/pages/schemas/schema-form.component.html
+++ b/src/Squidex/app/features/schemas/pages/schemas/schema-form.component.html
@@ -12,7 +12,7 @@
         <ng-container content>
             <sqx-form-error [error]="createForm.error | async"></sqx-form-error>
         
-            <div class="form-group">
+            <div class="form-group name-group">
                 <label for="schemaName">Name</label>
                 
                 <sqx-control-errors for="name" submitOnly="true" [submitted]="createForm.submitted | async"></sqx-control-errors>
@@ -28,10 +28,50 @@
             </div>
 
             <div class="form-group">
-                <a class="btn btn-sm btn-link" (click)="toggleImport()" [class.hidden]="showImport">
+                <div class="row no-gutters">
+                    <div class="col-6 type">
+                        <label>
+                            <input type="radio" class="radio-input" formControlName="singleton" [value]="false" />
+                        
+                            <div class="row no-gutters">
+                                <div class="col col-auto">
+                                    <div class="type-icon" [class.active]="createForm.form.controls['singleton'].value !== true">
+                                        <i class="icon-multiple-content"></i>
+                                    </div>
+                                </div>
+                                <div class="col-lg">
+                                    <div class="type-title">Multiple contents</div>
+                                    <div class="type-text text-muted">Blog posts, texts, pages...</div>
+                                </div>
+                            </div>
+
+                        </label>
+                    </div>
+                    <div class="col-6 type">
+                        <label>
+                            <input type="radio" class="radio-input" formControlName="singleton" [value]="true" />
+                        
+                            <div class="row no-gutters">
+                                <div class="col col-auto">
+                                    <div class="type-icon" [class.active]="createForm.form.controls['singleton'].value === true">
+                                        <i class="icon-single-content"></i>
+                                    </div>
+                                </div>
+                                <div class="col-lg">
+                                    <div class="type-title">Single content</div>
+                                    <div class="type-text text-muted">Settings, single content types</div>
+                                </div>
+                            </div>
+                        </label>
+                    </div>
+                </div>
+            </div>
+
+            <div class="form-group">
+                <a class="btn btn-sm btn-link force" (click)="toggleImport()" [class.hidden]="showImport">
                     Import schema
                 </a>
-                <a class="btn btn-sm btn-link" (click)="toggleImport()" [class.hidden]="!showImport">
+                <a class="btn btn-sm btn-link force" (click)="toggleImport()" [class.hidden]="!showImport">
                     Hide
                 </a>
         
diff --git a/src/Squidex/app/features/schemas/pages/schemas/schema-form.component.scss b/src/Squidex/app/features/schemas/pages/schemas/schema-form.component.scss
index 646a4d224..c4c3d16b7 100644
--- a/src/Squidex/app/features/schemas/pages/schemas/schema-form.component.scss
+++ b/src/Squidex/app/features/schemas/pages/schemas/schema-form.component.scss
@@ -1,6 +1,8 @@
 @import '_vars';
 @import '_mixins';
 
+$icon-size: 4.5rem;
+
 .btn-link {
     margin-top: -1rem;
     margin-left: -.5rem;
@@ -10,4 +12,64 @@
     height: 15rem !important;
     margin-bottom: .5rem;
     margin-top: 0;
+}
+
+.name-group {
+    margin-bottom: 1.5rem;
+}
+
+.type {
+    & {
+        margin-bottom: .5rem;
+    }
+
+    &-title {
+        font-weight: bold;
+    }
+
+    &-text {
+        font-size: .9rem;
+    }
+
+    &-icon {
+        & {
+            @include border-radius;
+            height: $icon-size;
+            color: $color-theme-blue;
+            cursor: pointer;
+            border: 1px solid $color-border;
+            background: transparent;
+            margin-right: .5rem;
+            line-height: $icon-size;
+            font-size: 1.75rem;
+            font-weight: normal;
+            text-align: center;
+            width: $icon-size;
+        }
+
+        .radio-input {
+            display: none;
+        }
+
+        &.active {
+            & {
+                @include box-shadow(0, 0, 10px, .5);
+                background: $color-theme-blue;
+                border-color: $color-theme-blue;
+                color: $color-dark-foreground;
+            }
+
+            &:hover {
+                color: $color-dark-foreground;
+            }
+        }
+
+        &:hover {
+            border-color: $color-border-dark;
+        }
+    }
+
+    .radio-input {
+        display: none;
+    }
 }
\ No newline at end of file
diff --git a/src/Squidex/app/features/schemas/pages/schemas/schema-form.component.ts b/src/Squidex/app/features/schemas/pages/schemas/schema-form.component.ts
index 2bfa367dc..b4e244c10 100644
--- a/src/Squidex/app/features/schemas/pages/schemas/schema-form.component.ts
+++ b/src/Squidex/app/features/schemas/pages/schemas/schema-form.component.ts
@@ -67,7 +67,7 @@ export class SchemaFormComponent implements OnInit {
         const value = this.createForm.submit();
 
         if (value) {
-            const schemaDto = Object.assign(value.import || {}, { name: value.name });
+            const schemaDto = Object.assign(value.import || {}, { name: value.name, singleton: value.singleton });
 
             this.schemasState.create(schemaDto)
                 .subscribe(dto => {
diff --git a/src/Squidex/app/shared/guards/schema-must-exist-published.guard.spec.ts b/src/Squidex/app/shared/guards/schema-must-exist-published.guard.spec.ts
index 20fb774bb..b5c10375a 100644
--- a/src/Squidex/app/shared/guards/schema-must-exist-published.guard.spec.ts
+++ b/src/Squidex/app/shared/guards/schema-must-exist-published.guard.spec.ts
@@ -5,10 +5,12 @@
  * Copyright (c) Squidex UG (haftungsbeschränkt). All rights reserved.
  */
 
-import { Router } from '@angular/router';
+import { Router, RouterStateSnapshot } from '@angular/router';
 import { of } from 'rxjs';
 import { IMock, Mock, Times } from 'typemoq';
 
+import { MathHelper } from '@app/framework';
+
 import { SchemaDetailsDto } from './../services/schemas.service';
 import { SchemasState } from './../state/schemas.state';
 import { SchemaMustExistPublishedGuard } from './schema-must-exist-published.guard';
@@ -21,6 +23,7 @@ describe('SchemaMustExistPublishedGuard', () => {
     };
 
     let schemasState: IMock<SchemasState>;
+    let state: RouterStateSnapshot = <any>{ url: 'current-url' };
     let router: IMock<Router>;
     let schemaGuard: SchemaMustExistPublishedGuard;
 
@@ -36,7 +39,7 @@ describe('SchemaMustExistPublishedGuard', () => {
 
         let result: boolean;
 
-        schemaGuard.canActivate(route).subscribe(x => {
+        schemaGuard.canActivate(route, state).subscribe(x => {
             result = x;
         }).unsubscribe();
 
@@ -51,7 +54,7 @@ describe('SchemaMustExistPublishedGuard', () => {
 
         let result: boolean;
 
-        schemaGuard.canActivate(route).subscribe(x => {
+        schemaGuard.canActivate(route, state).subscribe(x => {
             result = x;
         }).unsubscribe();
 
@@ -66,7 +69,7 @@ describe('SchemaMustExistPublishedGuard', () => {
 
         let result: boolean;
 
-        schemaGuard.canActivate(route).subscribe(x => {
+        schemaGuard.canActivate(route, state).subscribe(x => {
             result = x;
         }).unsubscribe();
 
@@ -74,4 +77,19 @@ describe('SchemaMustExistPublishedGuard', () => {
 
         router.verify(x => x.navigate(['/404']), Times.once());
     });
+
+    it('should redirect to content when singleton', () => {
+        schemasState.setup(x => x.select('123'))
+        .returns(() => of(<SchemaDetailsDto>{ isSingleton: true }));
+
+        let result: boolean;
+
+        schemaGuard.canActivate(route, state).subscribe(x => {
+            result = x;
+        }).unsubscribe();
+
+        expect(result!).toBeFalsy();
+
+        router.verify(x => x.navigate([state.url, MathHelper.EMPTY_GUID]), Times.once());
+    });
 });
\ No newline at end of file
diff --git a/src/Squidex/app/shared/guards/schema-must-exist-published.guard.ts b/src/Squidex/app/shared/guards/schema-must-exist-published.guard.ts
index 633718986..0d34f3f6a 100644
--- a/src/Squidex/app/shared/guards/schema-must-exist-published.guard.ts
+++ b/src/Squidex/app/shared/guards/schema-must-exist-published.guard.ts
@@ -6,11 +6,11 @@
  */
 
 import { Injectable } from '@angular/core';
-import { ActivatedRouteSnapshot, CanActivate, Router } from '@angular/router';
+import { ActivatedRouteSnapshot, CanActivate, Router, RouterStateSnapshot } from '@angular/router';
 import { Observable } from 'rxjs';
 import { map, tap } from 'rxjs/operators';
 
-import { allParams } from '@app/framework';
+import { allParams, MathHelper } from '@app/framework';
 
 import { SchemasState } from './../state/schemas.state';
 
@@ -22,7 +22,7 @@ export class SchemaMustExistPublishedGuard implements CanActivate {
     ) {
     }
 
-    public canActivate(route: ActivatedRouteSnapshot): Observable<boolean> {
+    public canActivate(route: ActivatedRouteSnapshot, state: RouterStateSnapshot): Observable<boolean> {
         const schemaName = allParams(route)['schemaName'];
 
         const result =
@@ -31,6 +31,10 @@ export class SchemaMustExistPublishedGuard implements CanActivate {
                     if (!dto || !dto.isPublished) {
                         this.router.navigate(['/404']);
                     }
+
+                    if (dto && dto.isSingleton && state.url.indexOf(MathHelper.EMPTY_GUID) < 0) {
+                        this.router.navigate([state.url, MathHelper.EMPTY_GUID]);
+                    }
                 }),
                 map(s => s !== null && s.isPublished));
 
diff --git a/src/Squidex/app/shared/services/schemas.service.spec.ts b/src/Squidex/app/shared/services/schemas.service.spec.ts
index b5d99e774..3b7df6d12 100644
--- a/src/Squidex/app/shared/services/schemas.service.spec.ts
+++ b/src/Squidex/app/shared/services/schemas.service.spec.ts
@@ -78,6 +78,7 @@ describe('SchemasService', () => {
                     label: 'label1',
                     hints: 'hints1'
                 },
+                isSingleton: true,
                 isPublished: true,
                 created: '2016-12-12T10:10',
                 createdBy: 'Created1',
@@ -94,6 +95,7 @@ describe('SchemasService', () => {
                     label: 'label2',
                     hints: 'hints2'
                 },
+                isSingleton: true,
                 isPublished: true,
                 created: '2016-10-12T10:10',
                 createdBy: 'Created2',
@@ -106,11 +108,11 @@ describe('SchemasService', () => {
 
         expect(schemas!).toEqual(
             [
-                new SchemaDto('id1', 'name1', 'category1', new SchemaPropertiesDto('label1', 'hints1'), true,
+                new SchemaDto('id1', 'name1', 'category1', new SchemaPropertiesDto('label1', 'hints1'), true, true,
                     DateTime.parseISO_UTC('2016-12-12T10:10'), 'Created1',
                     DateTime.parseISO_UTC('2017-12-12T10:10'), 'LastModifiedBy1',
                     new Version('11')),
-                new SchemaDto('id2', 'name2', 'category2', new SchemaPropertiesDto('label2', 'hints2'), true,
+                new SchemaDto('id2', 'name2', 'category2', new SchemaPropertiesDto('label2', 'hints2'), true, true,
                     DateTime.parseISO_UTC('2016-10-12T10:10'), 'Created2',
                     DateTime.parseISO_UTC('2017-10-12T10:10'), 'LastModifiedBy2',
                     new Version('22'))
@@ -135,6 +137,7 @@ describe('SchemasService', () => {
             id: 'id1',
             name: 'name1',
             category: 'category1',
+            isSingleton: true,
             isPublished: true,
             created: '2016-12-12T10:10',
             createdBy: 'Created1',
@@ -290,7 +293,7 @@ describe('SchemasService', () => {
         });
 
         expect(schema!).toEqual(
-            new SchemaDetailsDto('id1', 'name1', 'category1', new SchemaPropertiesDto('label1', 'hints1'), true,
+            new SchemaDetailsDto('id1', 'name1', 'category1', new SchemaPropertiesDto('label1', 'hints1'), true, true,
                 DateTime.parseISO_UTC('2016-12-12T10:10'), 'Created1',
                 DateTime.parseISO_UTC('2017-12-12T10:10'), 'LastModifiedBy1',
                 new Version('2'),
@@ -319,7 +322,7 @@ describe('SchemasService', () => {
     it('should make post request to create schema',
         inject([SchemasService, HttpTestingController], (schemasService: SchemasService, httpMock: HttpTestingController) => {
 
-        const dto = new CreateSchemaDto('name');
+        const dto = new CreateSchemaDto('name', undefined, undefined, true);
 
         let schema: SchemaDetailsDto;
 
@@ -341,7 +344,7 @@ describe('SchemasService', () => {
         });
 
         expect(schema!).toEqual(
-            new SchemaDetailsDto('1', dto.name, '', new SchemaPropertiesDto(), false, now, user, now, user, new Version('2'), []));
+            new SchemaDetailsDto('1', dto.name, '', new SchemaPropertiesDto(), true, false, now, user, now, user, new Version('2'), []));
     }));
 
     it('should make put request to update schema',
diff --git a/src/Squidex/app/shared/services/schemas.service.ts b/src/Squidex/app/shared/services/schemas.service.ts
index 6d4f3eb5e..6f22d8282 100644
--- a/src/Squidex/app/shared/services/schemas.service.ts
+++ b/src/Squidex/app/shared/services/schemas.service.ts
@@ -34,6 +34,7 @@ export class SchemaDto extends Model {
         public readonly name: string,
         public readonly category: string,
         public readonly properties: SchemaPropertiesDto,
+        public readonly isSingleton: boolean,
         public readonly isPublished: boolean,
         public readonly created: DateTime,
         public readonly createdBy: string,
@@ -53,7 +54,7 @@ export class SchemaDetailsDto extends SchemaDto {
     public listFields: RootFieldDto[];
     public listFieldsEditable: RootFieldDto[];
 
-    constructor(id: string, name: string, category: string, properties: SchemaPropertiesDto, isPublished: boolean, created: DateTime, createdBy: string, lastModified: DateTime, lastModifiedBy: string, version: Version,
+    constructor(id: string, name: string, category: string, properties: SchemaPropertiesDto, isSingleton: boolean, isPublished: boolean, created: DateTime, createdBy: string, lastModified: DateTime, lastModifiedBy: string, version: Version,
         public readonly fields: RootFieldDto[],
         public readonly scriptQuery?: string,
         public readonly scriptCreate?: string,
@@ -61,7 +62,7 @@ export class SchemaDetailsDto extends SchemaDto {
         public readonly scriptDelete?: string,
         public readonly scriptChange?: string
     ) {
-        super(id, name, category, properties, isPublished, created, createdBy, lastModified, lastModifiedBy, version);
+        super(id, name, category, properties, isSingleton, isPublished, created, createdBy, lastModified, lastModifiedBy, version);
 
         this.onCloned();
     }
@@ -177,7 +178,8 @@ export class CreateSchemaDto {
     constructor(
         public readonly name: string,
         public readonly fields?: RootFieldDto[],
-        public readonly properties?: SchemaPropertiesDto
+        public readonly properties?: SchemaPropertiesDto,
+        public readonly isSingleton?: boolean
     ) {
     }
 }
@@ -240,6 +242,7 @@ export class SchemasService {
                         item.id,
                         item.name,
                         item.category, properties,
+                        item.isSingleton,
                         item.isPublished,
                         DateTime.parseISO_UTC(item.created), item.createdBy,
                         DateTime.parseISO_UTC(item.lastModified), item.lastModifiedBy,
@@ -300,6 +303,7 @@ export class SchemasService {
                     body.name,
                     body.category,
                     properties,
+                    body.isSingleton,
                     body.isPublished,
                     DateTime.parseISO_UTC(body.created), body.createdBy,
                     DateTime.parseISO_UTC(body.lastModified), body.lastModifiedBy,
@@ -328,6 +332,7 @@ export class SchemasService {
                     dto.name,
                     '',
                     dto.properties || new SchemaPropertiesDto(),
+                    dto.isSingleton === true,
                     false,
                     now, user,
                     now, user,
diff --git a/src/Squidex/app/shared/state/contents.forms.spec.ts b/src/Squidex/app/shared/state/contents.forms.spec.ts
index fbf86b36a..61da6789d 100644
--- a/src/Squidex/app/shared/state/contents.forms.spec.ts
+++ b/src/Squidex/app/shared/state/contents.forms.spec.ts
@@ -371,7 +371,7 @@ describe('StringField', () => {
 });
 
 function createSchema(properties: SchemaPropertiesDto, index = 1, fields: RootFieldDto[]) {
-    return new SchemaDetailsDto('id' + index, 'schema' + index, '', properties, true, null!, null!, null!, null!, null!, fields);
+    return new SchemaDetailsDto('id' + index, 'schema' + index, '', properties, false, true, null!, null!, null!, null!, null!, fields);
 }
 
 function createField(properties: FieldPropertiesDto, index = 1, partitioning = 'languages') {
diff --git a/src/Squidex/app/shared/state/contents.state.ts b/src/Squidex/app/shared/state/contents.state.ts
index fb4300868..98d4fdaf2 100644
--- a/src/Squidex/app/shared/state/contents.state.ts
+++ b/src/Squidex/app/shared/state/contents.state.ts
@@ -213,7 +213,9 @@ export abstract class ContentsStateBase extends State<Snapshot> {
             tap(dto => {
                 this.dialogs.notifyInfo('Content updated successfully.');
 
-                this.replaceContent(updateData(content, dto.payload, this.user, dto.version, now));
+                if (dto.version.value !== content.version.value) {
+                    this.replaceContent(updateData(content, dto.payload, this.user, dto.version, now));
+                }
             }),
             notify(this.dialogs));
     }
@@ -223,7 +225,9 @@ export abstract class ContentsStateBase extends State<Snapshot> {
             tap(dto => {
                 this.dialogs.notifyInfo('Content updated successfully.');
 
-                this.replaceContent(updateDataDraft(content, dto.payload, this.user, dto.version, now));
+                if (dto.version.value !== content.version.value) {
+                    this.replaceContent(updateDataDraft(content, dto.payload, this.user, dto.version, now));
+                }
             }),
             notify(this.dialogs));
     }
@@ -233,7 +237,9 @@ export abstract class ContentsStateBase extends State<Snapshot> {
             tap(dto => {
                 this.dialogs.notifyInfo('Content updated successfully.');
 
-                this.replaceContent(discardChanges(content, this.user, dto.version, now));
+                if (dto.version.value !== content.version.value) {
+                    this.replaceContent(discardChanges(content, this.user, dto.version, now));
+                }
             }),
             notify(this.dialogs));
     }
@@ -243,7 +249,9 @@ export abstract class ContentsStateBase extends State<Snapshot> {
             tap(dto => {
                 this.dialogs.notifyInfo('Content updated successfully.');
 
-                this.replaceContent(updateData(content, dto.payload, this.user, dto.version, now));
+                if (dto.version.value !== content.version.value) {
+                    this.replaceContent(updateData(content, dto.payload, this.user, dto.version, now));
+                }
             }),
             notify(this.dialogs));
     }
diff --git a/src/Squidex/app/shared/state/schemas.forms.ts b/src/Squidex/app/shared/state/schemas.forms.ts
index 75930b75a..e3866789c 100644
--- a/src/Squidex/app/shared/state/schemas.forms.ts
+++ b/src/Squidex/app/shared/state/schemas.forms.ts
@@ -36,6 +36,7 @@ export class CreateSchemaForm extends Form<FormGroup> {
                     ValidatorsEx.pattern('[a-z0-9]+(\-[a-z0-9]+)*', 'Name can contain lower case letters (a-z), numbers and dashes only (not at the end).')
                 ]
             ],
+            singleton: false,
             import: {}
         }));
     }
diff --git a/src/Squidex/app/shared/state/schemas.state.spec.ts b/src/Squidex/app/shared/state/schemas.state.spec.ts
index b25f318b6..c02091aac 100644
--- a/src/Squidex/app/shared/state/schemas.state.spec.ts
+++ b/src/Squidex/app/shared/state/schemas.state.spec.ts
@@ -41,8 +41,8 @@ describe('SchemasState', () => {
     const newVersion = new Version('2');
 
     const oldSchemas = [
-        new SchemaDto('id1', 'name1', 'category1', {}, false, creation, creator, creation, creator, version),
-        new SchemaDto('id2', 'name2', 'category2', {}, true , creation, creator, creation, creator, version)
+        new SchemaDto('id1', 'name1', 'category1', {}, false, false, creation, creator, creation, creator, version),
+        new SchemaDto('id2', 'name2', 'category2', {}, false, true , creation, creator, creation, creator, version)
     ];
 
     const nested1 = new NestedFieldDto(3, '3', createProperties('Number'), 2);
@@ -52,7 +52,7 @@ describe('SchemasState', () => {
     const field2 = new RootFieldDto(2, '2', createProperties('Array'), 'invariant', true, true, true, [nested1, nested2]);
 
     const schema =
-        new SchemaDetailsDto('id2', 'name2', 'category2', {}, true,
+        new SchemaDetailsDto('id2', 'name2', 'category2', {}, false, true,
             creation, creator,
             creation, creator,
             version,
@@ -284,7 +284,7 @@ describe('SchemasState', () => {
         it('should add schema to snapshot when created', () => {
             const request = new CreateSchemaDto('newName');
 
-            const result = new SchemaDetailsDto('id4', 'newName', '', {}, false, modified, modifier, modified, modifier, version, []);
+            const result = new SchemaDetailsDto('id4', 'newName', '', {}, false, false, modified, modifier, modified, modifier, version, []);
 
             schemasService.setup(x => x.postSchema(app, request, modifier, modified))
                 .returns(() => of(result));
diff --git a/src/Squidex/app/theme/icomoon/demo.html b/src/Squidex/app/theme/icomoon/demo.html
index aefcf21b8..42b1ac10c 100644
--- a/src/Squidex/app/theme/icomoon/demo.html
+++ b/src/Squidex/app/theme/icomoon/demo.html
@@ -9,10 +9,42 @@
     <link rel="stylesheet" href="style.css"></head>
 <body>
     <div class="bgc1 clearfix">
-        <h1 class="mhmm mvm"><span class="fgc1">Font Name:</span> icomoon <small class="fgc1">(Glyphs:&nbsp;90)</small></h1>
+        <h1 class="mhmm mvm"><span class="fgc1">Font Name:</span> icomoon <small class="fgc1">(Glyphs:&nbsp;92)</small></h1>
     </div>
     <div class="clearfix mhl ptl">
         <h1 class="mvm mtn fgc1">Grid Size: 14</h1>
+        <div class="glyph fs1">
+            <div class="clearfix bshadow0 pbs">
+                <span class="icon-single-content">
+                
+                </span>
+                <span class="mls"> icon-single-content</span>
+            </div>
+            <fieldset class="fs0 size1of1 clearfix hidden-false">
+                <input type="text" readonly value="e958" class="unit size1of2" />
+                <input type="text" maxlength="1" readonly value="&#xe958;" class="unitRight size1of2 talign-right" />
+            </fieldset>
+            <div class="fs0 bshadow0 clearfix hidden-true">
+                <span class="unit pvs fgc1">liga: </span>
+                <input type="text" readonly value="" class="liga unitRight" />
+            </div>
+        </div>
+        <div class="glyph fs1">
+            <div class="clearfix bshadow0 pbs">
+                <span class="icon-multiple-content">
+                
+                </span>
+                <span class="mls"> icon-multiple-content</span>
+            </div>
+            <fieldset class="fs0 size1of1 clearfix hidden-false">
+                <input type="text" readonly value="e957" class="unit size1of2" />
+                <input type="text" maxlength="1" readonly value="&#xe957;" class="unitRight size1of2 talign-right" />
+            </fieldset>
+            <div class="fs0 bshadow0 clearfix hidden-true">
+                <span class="unit pvs fgc1">liga: </span>
+                <input type="text" readonly value="" class="liga unitRight" />
+            </div>
+        </div>
         <div class="glyph fs1">
             <div class="clearfix bshadow0 pbs">
                 <span class="icon-type-Array">
diff --git a/src/Squidex/app/theme/icomoon/fonts/icomoon.eot b/src/Squidex/app/theme/icomoon/fonts/icomoon.eot
index b1f623178..9e1dac2c5 100644
Binary files a/src/Squidex/app/theme/icomoon/fonts/icomoon.eot and b/src/Squidex/app/theme/icomoon/fonts/icomoon.eot differ
diff --git a/src/Squidex/app/theme/icomoon/fonts/icomoon.svg b/src/Squidex/app/theme/icomoon/fonts/icomoon.svg
index 094cf6b9e..e5f1e9156 100644
--- a/src/Squidex/app/theme/icomoon/fonts/icomoon.svg
+++ b/src/Squidex/app/theme/icomoon/fonts/icomoon.svg
@@ -94,6 +94,8 @@
 <glyph unicode="&#xe954;" glyph-name="hour-glass" d="M728.992 448c137.754 87.334 231.008 255.208 231.008 448 0 21.676-1.192 43.034-3.478 64h-889.042c-2.29-20.968-3.48-42.326-3.48-64 0-192.792 93.254-360.666 231.006-448-137.752-87.334-231.006-255.208-231.006-448 0-21.676 1.19-43.034 3.478-64h889.042c2.288 20.966 3.478 42.324 3.478 64 0.002 192.792-93.252 360.666-231.006 448zM160 0c0 186.912 80.162 345.414 224 397.708v100.586c-143.838 52.29-224 210.792-224 397.706v0h704c0-186.914-80.162-345.416-224-397.706v-100.586c143.838-52.294 224-210.796 224-397.708h-704zM619.626 290.406c-71.654 40.644-75.608 93.368-75.626 125.366v64.228c0 31.994 3.804 84.914 75.744 125.664 38.504 22.364 71.808 56.348 97.048 98.336h-409.582c25.266-42.032 58.612-76.042 97.166-98.406 71.654-40.644 75.606-93.366 75.626-125.366v-64.228c0-31.992-3.804-84.914-75.744-125.664-72.622-42.18-126.738-125.684-143.090-226.336h501.67c-16.364 100.708-70.53 184.248-143.212 226.406z" />
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diff --git a/src/Squidex/app/theme/icomoon/selection.json b/src/Squidex/app/theme/icomoon/selection.json
index 4787eaf86..0ea70b229 100644
--- a/src/Squidex/app/theme/icomoon/selection.json
+++ b/src/Squidex/app/theme/icomoon/selection.json
@@ -1,6 +1,87 @@
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       "setId": 1,
-      "iconIdx": 83
+      "iconIdx": 86
     },
     {
       "icon": {
@@ -2625,7 +2706,7 @@
       },
       "setIdx": 0,
       "setId": 1,
-      "iconIdx": 84
+      "iconIdx": 87
     },
     {
       "icon": {
@@ -2657,7 +2738,7 @@
       },
       "setIdx": 0,
       "setId": 1,
-      "iconIdx": 85
+      "iconIdx": 88
     },
     {
       "icon": {
@@ -2687,7 +2768,7 @@
       },
       "setIdx": 0,
       "setId": 1,
-      "iconIdx": 86
+      "iconIdx": 89
     },
     {
       "icon": {
@@ -2716,7 +2797,7 @@
       },
       "setIdx": 0,
       "setId": 1,
-      "iconIdx": 87
+      "iconIdx": 90
     },
     {
       "icon": {
@@ -2745,7 +2826,7 @@
       },
       "setIdx": 0,
       "setId": 1,
-      "iconIdx": 88
+      "iconIdx": 91
     },
     {
       "icon": {
@@ -2774,7 +2855,7 @@
       },
       "setIdx": 0,
       "setId": 1,
-      "iconIdx": 89
+      "iconIdx": 92
     }
   ],
   "height": 1024,
diff --git a/src/Squidex/app/theme/icomoon/style.css b/src/Squidex/app/theme/icomoon/style.css
index 2d0eae8ba..3c0abb955 100644
--- a/src/Squidex/app/theme/icomoon/style.css
+++ b/src/Squidex/app/theme/icomoon/style.css
@@ -1,10 +1,10 @@
 @font-face {
   font-family: 'icomoon';
-  src:  url('fonts/icomoon.eot?ebsjd4');
-  src:  url('fonts/icomoon.eot?ebsjd4#iefix') format('embedded-opentype'),
-    url('fonts/icomoon.ttf?ebsjd4') format('truetype'),
-    url('fonts/icomoon.woff?ebsjd4') format('woff'),
-    url('fonts/icomoon.svg?ebsjd4#icomoon') format('svg');
+  src:  url('fonts/icomoon.eot?vrpp1i');
+  src:  url('fonts/icomoon.eot?vrpp1i#iefix') format('embedded-opentype'),
+    url('fonts/icomoon.ttf?vrpp1i') format('truetype'),
+    url('fonts/icomoon.woff?vrpp1i') format('woff'),
+    url('fonts/icomoon.svg?vrpp1i#icomoon') format('svg');
   font-weight: normal;
   font-style: normal;
 }
@@ -24,6 +24,12 @@
   -moz-osx-font-smoothing: grayscale;
 }
 
+.icon-single-content:before {
+  content: "\e958";
+}
+.icon-multiple-content:before {
+  content: "\e957";
+}
 .icon-type-Array:before {
   content: "\e956";
 }
diff --git a/tests/Squidex.Domain.Apps.Entities.Tests/Contents/Guard/GuardContentTests.cs b/tests/Squidex.Domain.Apps.Entities.Tests/Contents/Guard/GuardContentTests.cs
index f3a1ed76b..56357383f 100644
--- a/tests/Squidex.Domain.Apps.Entities.Tests/Contents/Guard/GuardContentTests.cs
+++ b/tests/Squidex.Domain.Apps.Entities.Tests/Contents/Guard/GuardContentTests.cs
@@ -5,10 +5,13 @@
 //  All rights reserved. Licensed under the MIT license.
 // ==========================================================================
 
+using System;
+using FakeItEasy;
 using NodaTime;
 using Squidex.Domain.Apps.Core.Contents;
 using Squidex.Domain.Apps.Entities.Contents.Commands;
 using Squidex.Domain.Apps.Entities.Contents.Guards;
+using Squidex.Domain.Apps.Entities.Schemas;
 using Squidex.Domain.Apps.Entities.TestHelpers;
 using Squidex.Infrastructure;
 using Xunit;
@@ -17,6 +20,7 @@ namespace Squidex.Domain.Apps.Entities.Contents.Guard
 {
     public class GuardContentTests
     {
+        private readonly ISchemaEntity schema = A.Fake<ISchemaEntity>();
         private readonly Instant dueTimeInPast = SystemClock.Instance.GetCurrentInstant().Minus(Duration.FromHours(1));
 
         [Fact]
@@ -24,16 +28,36 @@ namespace Squidex.Domain.Apps.Entities.Contents.Guard
         {
             var command = new CreateContent();
 
-            ValidationAssert.Throws(() => GuardContent.CanCreate(command),
+            ValidationAssert.Throws(() => GuardContent.CanCreate(schema, command),
                 new ValidationError("Data is required.", "Data"));
         }
 
+        [Fact]
+        public void CanCreate_should_throw_exception_if_singleton()
+        {
+            A.CallTo(() => schema.IsSingleton).Returns(true);
+
+            var command = new CreateContent { Data = new NamedContentData() };
+
+            Assert.Throws<DomainException>(() => GuardContent.CanCreate(schema, command));
+        }
+
+        [Fact]
+        public void CanCreate_should_not_throw_exception_if_singleton_and_id_empty()
+        {
+            A.CallTo(() => schema.IsSingleton).Returns(true);
+
+            var command = new CreateContent { Data = new NamedContentData(), ContentId = Guid.Empty };
+
+            GuardContent.CanCreate(schema, command);
+        }
+
         [Fact]
         public void CanCreate_should_not_throw_exception_if_data_is_not_null()
         {
             var command = new CreateContent { Data = new NamedContentData() };
 
-            GuardContent.CanCreate(command);
+            GuardContent.CanCreate(schema, command);
         }
 
         [Fact]
@@ -75,7 +99,7 @@ namespace Squidex.Domain.Apps.Entities.Contents.Guard
         {
             var command = new ChangeContentStatus { Status = (Status)10 };
 
-            ValidationAssert.Throws(() => GuardContent.CanChangeContentStatus(false, Status.Archived, command),
+            ValidationAssert.Throws(() => GuardContent.CanChangeContentStatus(schema, false, Status.Archived, command),
                 new ValidationError("Status is not valid.", "Status"));
         }
 
@@ -84,7 +108,7 @@ namespace Squidex.Domain.Apps.Entities.Contents.Guard
         {
             var command = new ChangeContentStatus { Status = Status.Published };
 
-            ValidationAssert.Throws(() => GuardContent.CanChangeContentStatus(false, Status.Archived, command),
+            ValidationAssert.Throws(() => GuardContent.CanChangeContentStatus(schema, false, Status.Archived, command),
                 new ValidationError("Cannot change status from Archived to Published.", "Status"));
         }
 
@@ -93,7 +117,7 @@ namespace Squidex.Domain.Apps.Entities.Contents.Guard
         {
             var command = new ChangeContentStatus { Status = Status.Published, DueTime = dueTimeInPast };
 
-            ValidationAssert.Throws(() => GuardContent.CanChangeContentStatus(false, Status.Draft, command),
+            ValidationAssert.Throws(() => GuardContent.CanChangeContentStatus(schema, false, Status.Draft, command),
                 new ValidationError("Due time must be in the future.", "DueTime"));
         }
 
@@ -102,16 +126,28 @@ namespace Squidex.Domain.Apps.Entities.Contents.Guard
         {
             var command = new ChangeContentStatus { Status = Status.Published };
 
-            ValidationAssert.Throws(() => GuardContent.CanChangeContentStatus(false, Status.Published, command),
+            ValidationAssert.Throws(() => GuardContent.CanChangeContentStatus(schema, false, Status.Published, command),
                 new ValidationError("Content has no changes to publish.", "Status"));
         }
 
+        [Fact]
+        public void CanChangeContentStatus_should_throw_exception_if_singleton()
+        {
+            A.CallTo(() => schema.IsSingleton).Returns(true);
+
+            var command = new ChangeContentStatus { Status = Status.Draft };
+
+            Assert.Throws<DomainException>(() => GuardContent.CanChangeContentStatus(schema, false, Status.Published, command));
+        }
+
         [Fact]
         public void CanChangeContentStatus_should_not_throw_exception_if_publishing_with_pending_changes()
         {
+            A.CallTo(() => schema.IsSingleton).Returns(true);
+
             var command = new ChangeContentStatus { Status = Status.Published };
 
-            GuardContent.CanChangeContentStatus(true, Status.Published, command);
+            GuardContent.CanChangeContentStatus(schema, true, Status.Published, command);
         }
 
         [Fact]
@@ -119,7 +155,7 @@ namespace Squidex.Domain.Apps.Entities.Contents.Guard
         {
             var command = new ChangeContentStatus { Status = Status.Published };
 
-            GuardContent.CanChangeContentStatus(false, Status.Draft, command);
+            GuardContent.CanChangeContentStatus(schema, false, Status.Draft, command);
         }
 
         [Fact]
@@ -139,11 +175,21 @@ namespace Squidex.Domain.Apps.Entities.Contents.Guard
         }
 
         [Fact]
-        public void CanPatch_should_not_throw_exception()
+        public void CanDelete_should_throw_exception_if_singleton()
+        {
+            A.CallTo(() => schema.IsSingleton).Returns(true);
+
+            var command = new DeleteContent();
+
+            Assert.Throws<DomainException>(() => GuardContent.CanDelete(schema, command));
+        }
+
+        [Fact]
+        public void CanDelete_should_not_throw_exception()
         {
             var command = new DeleteContent();
 
-            GuardContent.CanDelete(command);
+            GuardContent.CanDelete(schema, command);
         }
     }
 }
diff --git a/tests/Squidex.Domain.Apps.Entities.Tests/Contents/SingletonCommandMiddlewareTests.cs b/tests/Squidex.Domain.Apps.Entities.Tests/Contents/SingletonCommandMiddlewareTests.cs
new file mode 100644
index 000000000..27587abd7
--- /dev/null
+++ b/tests/Squidex.Domain.Apps.Entities.Tests/Contents/SingletonCommandMiddlewareTests.cs
@@ -0,0 +1,60 @@
+// ==========================================================================
+//  Squidex Headless CMS
+// ==========================================================================
+//  Copyright (c) Squidex UG (haftungsbeschraenkt)
+//  All rights reserved. Licensed under the MIT license.
+// ==========================================================================
+
+using System.Threading.Tasks;
+using FakeItEasy;
+using Squidex.Domain.Apps.Entities.Contents.Commands;
+using Squidex.Domain.Apps.Entities.Schemas.Commands;
+using Squidex.Infrastructure.Commands;
+using Xunit;
+
+namespace Squidex.Domain.Apps.Entities.Contents
+{
+    public sealed class SingletonCommandMiddlewareTests
+    {
+        private readonly ICommandBus commandBus = A.Fake<ICommandBus>();
+        private readonly SingletonCommandMiddleware sut = new SingletonCommandMiddleware();
+
+        [Fact]
+        public async Task Should_create_content_when_singleton_schema_is_created()
+        {
+            var context =
+                new CommandContext(new CreateSchema { Singleton = true, Name = "my-schema" }, commandBus)
+                    .Complete();
+
+            await sut.HandleAsync(context);
+
+            A.CallTo(() => commandBus.PublishAsync(A<ICommand>.That.Matches(x => x is CreateContent)))
+                .MustHaveHappened();
+        }
+
+        [Fact]
+        public async Task Should_not_create_content_when_non_singleton_schema_is_created()
+        {
+            var context =
+                new CommandContext(new CreateSchema { Singleton = false }, commandBus)
+                    .Complete();
+
+            await sut.HandleAsync(context);
+
+            A.CallTo(() => commandBus.PublishAsync(A<ICommand>.Ignored))
+                .MustNotHaveHappened();
+        }
+
+        [Fact]
+        public async Task Should_not_create_content_when_singleton_schema_not_created()
+        {
+            var context =
+                new CommandContext(new CreateSchema { Singleton = true }, commandBus);
+
+            await sut.HandleAsync(context);
+
+            A.CallTo(() => commandBus.PublishAsync(A<ICommand>.Ignored))
+                .MustNotHaveHappened();
+        }
+    }
+}
diff --git a/tests/Squidex.Domain.Apps.Entities.Tests/Schemas/SchemaGrainTests.cs b/tests/Squidex.Domain.Apps.Entities.Tests/Schemas/SchemaGrainTests.cs
index bf0e83ad7..cd880f849 100644
--- a/tests/Squidex.Domain.Apps.Entities.Tests/Schemas/SchemaGrainTests.cs
+++ b/tests/Squidex.Domain.Apps.Entities.Tests/Schemas/SchemaGrainTests.cs
@@ -62,7 +62,7 @@ namespace Squidex.Domain.Apps.Entities.Schemas
         {
             var properties = new SchemaProperties();
 
-            var command = new CreateSchema { Name = SchemaName, SchemaId = SchemaId, Properties = properties };
+            var command = new CreateSchema { Name = SchemaName, SchemaId = SchemaId, Properties = properties, Singleton = true };
 
             var result = await sut.ExecuteAsync(CreateCommand(command));
 
@@ -72,10 +72,11 @@ namespace Squidex.Domain.Apps.Entities.Schemas
 
             Assert.Equal(SchemaName, sut.Snapshot.Name);
             Assert.Equal(SchemaName, sut.Snapshot.SchemaDef.Name);
+            Assert.True(sut.Snapshot.IsSingleton);
 
             LastEvents
                 .ShouldHaveSameEvents(
-                    CreateEvent(new SchemaCreated { Name = SchemaName, Properties = properties })
+                    CreateEvent(new SchemaCreated { Name = SchemaName, Properties = properties, Singleton = true })
                 );
         }