Use classes from latest AngleSharp

Author: FlorianRappl

src/AngleSharp.Xml/Dom/Entity.cs

@@ -1,6 +1,6 @@
 namespace AngleSharp.Xml.Dtd.Parser
 {
-    using AngleSharp.Xml.Dom;
+    using AngleSharp.Dom;
     using System;
 
     sealed class DtdEntityToken : DtdToken
@@ -66,7 +66,7 @@ public String ExternNotation
 
         public Entity ToElement()
         {
-            return new Entity(Name)
+            return new Entity(null, Name)
             {
                 NotationName = null,
                 NodeValue = Value

src/AngleSharp.Xml/Dom/Notation.cs

@@ -1,6 +1,6 @@
 namespace AngleSharp.Xml.Dtd.Parser
 {
-    using AngleSharp.Xml.Dom;
+    using AngleSharp.Dom;
     using System;
 
     sealed class DtdNotationToken : DtdToken
@@ -68,7 +68,7 @@ public String SystemIdentifier
 
         public Notation ToElement()
         {
-            return new Notation(Name)
+            return new Notation(null, Name)
             {
                 PublicId = PublicIdentifier,
                 SystemId = SystemIdentifier

src/AngleSharp.Xml/Dtd/Parser/Tokens/DtdEntityToken.cs

@@ -5,6 +5,7 @@ namespace AngleSharp.Xml
     using AngleSharp.Svg.Dom;
     using AngleSharp.Xml.Dom;
     using AngleSharp.Xml.Parser;
+    using System;
     using System.Linq;
     using System.Threading;
     using System.Threading.Tasks;
@@ -38,7 +39,7 @@ public static IConfiguration WithXml(this IConfiguration configuration)
 
         private static Task<IDocument> LoadXmlAsync(IBrowsingContext context, CreateDocumentOptions options, CancellationToken cancellationToken)
         {
-            var parser = context.GetService<IXmlParser>();
+            var parser = context.GetService<IXmlParser>() ?? throw new InvalidOperationException("The IXmlParser service has been removed. Cannot continue.");
             var document = new XmlDocument(context, options.Source);
             document.Setup(options.Response, options.ContentType, options.ImportAncestor);
             context.NavigateTo(document);
@@ -47,7 +48,7 @@ private static Task<IDocument> LoadXmlAsync(IBrowsingContext context, CreateDocu
 
         private static Task<IDocument> LoadSvgAsync(IBrowsingContext context, CreateDocumentOptions options, CancellationToken cancellationToken)
         {
-            var parser = context.GetService<IXmlParser>();
+            var parser = context.GetService<IXmlParser>() ?? throw new InvalidOperationException("The IXmlParser service has been removed. Cannot continue.");
             var document = new SvgDocument(context, options.Source);
             document.Setup(options.Response, options.ContentType, options.ImportAncestor);
             context.NavigateTo(document);