Add documentation for Layout Artifacts

Source/QuestPDF/Fluent/SemanticExtensions.cs

@@ -375,46 +375,81 @@ public static class SemanticExtensions
     
     #endregion
     
-    public static IContainer Artifact(this IContainer container, int nodeId)
+    private static IContainer Artifact(this IContainer container, int nodeId)
     {
-        return container.SemanticTag("Code");
+        return container.Element(new Elements.SemanticTag
+        {
+            Id = nodeId
+        });
     }
     
+    /// <summary>
+    /// Marks the container content as a generic PDF artifact.
+    /// Generic artifacts are non-structural elements that don't fit into other specific categories.
+    /// </summary>
     public static IContainer ArtifactOther(this IContainer container)
     {
         return container.Artifact(SkSemanticNodeSpecialId.OtherArtifact);
     }
-    
+
+    /// <summary>
+    /// Marks the container content as a pagination artifact.
+    /// Used for page-related content that isn't part of the document's logical structure.
+    /// </summary>
     public static IContainer ArtifactPagination(this IContainer container)
     {
         return container.Artifact(SkSemanticNodeSpecialId.PaginationArtifact);
     }
-    
+
+    /// <summary>
+    /// Marks the container content as a page header artifact.
+    /// Used for repeating header content that appears at the top of pages.
+    /// </summary>
     public static IContainer ArtifactPaginationHeader(this IContainer container)
     {
         return container.Artifact(SkSemanticNodeSpecialId.PaginationHeaderArtifact);
     }
-    
+
+    /// <summary>
+    /// Marks the container content as a page footer artifact.
+    /// Used for repeating footer content that appears at the bottom of pages.
+    /// </summary>
     public static IContainer ArtifactPaginationFooter(this IContainer container)
     {
         return container.Artifact(SkSemanticNodeSpecialId.PaginationFooterArtifact);
     }
-    
+
+    /// <summary>
+    /// Marks the container content as a watermark artifact.
+    /// Used for watermark content that overlays the page but isn't part of the document structure.
+    /// </summary>
     public static IContainer ArtifactPaginationWatermark(this IContainer container)
     {
         return container.Artifact(SkSemanticNodeSpecialId.PaginationWatermarkArtifact);
     }
-    
+
+    /// <summary>
+    /// Marks the container content as a layout artifact.
+    /// Used for decorative or layout-related content that doesn't convey document meaning.
+    /// </summary>
     public static IContainer ArtifactLayout(this IContainer container)
     {
         return container.Artifact(SkSemanticNodeSpecialId.LayoutArtifact);
     }
-    
+
+    /// <summary>
+    /// Marks the container content as a page artifact.
+    /// Used for page-level decorative elements that aren't part of the document's logical structure.
+    /// </summary>
     public static IContainer ArtifactPage(this IContainer container)
     {
         return container.Artifact(SkSemanticNodeSpecialId.PageArtifact);
     }
-    
+
+    /// <summary>
+    /// Marks the container content as a background artifact.
+    /// Used for background graphics or shading that doesn't convey document meaning.
+    /// </summary>
     public static IContainer ArtifactBackground(this IContainer container)
     {
         return container.Artifact(SkSemanticNodeSpecialId.BackgroundArtifact);