Created FileList with ability to set used files

HaDocumentNew/Settings/XMLRoots/CommentRoot.cs

@@ -0,0 +1,50 @@
+namespace HaDocument.Settings.XMLRoots;
+using System.Xml.Linq;
+
+public class CommentRoot : HaWeb.XMLParser.IXMLRoot {
+    public string Type { get; } = "Register";
+    public string Prefix { get; } = "register";
+    public string[] XPathContainer { get; } = { ".//data//kommentare/kommcat", ".//kommentare/kommcat" };
+
+    public Predicate<XElement> IsCollectedObject { get; } = (elem) => {
+        if (elem.Name == "kommentar") return true;
+        else return false;
+    };
+
+    public Func<XElement, string?> GetKey { get; } = (elem) => {
+        var index = elem.Attribute("id");
+        if (index != null && !String.IsNullOrWhiteSpace(index.Value))
+            return index.Value;
+        else return null;
+    };
+
+    public List<(string, string?)>? GenerateFields(XMLRootDocument document) {
+        return null;
+    }
+
+    public (string?, string?) GenerateIdentificationString(XElement element) {
+        var kat = element.Attribute("value");
+        if (kat != null && !String.IsNullOrWhiteSpace(kat.Value))
+            return (null, kat.Value);
+        return (null, null);
+    }
+
+    public bool Replaces(XMLRootDocument doc1, XMLRootDocument doc2) {
+        return true;
+    }
+
+    public XElement CreateHamannDocument(XElement element) {
+        var opus = new XElement("opus");
+        var kommentare = new XElement("kommentare");
+        kommentare.AddFirst(element);
+        opus.AddFirst(kommentare);
+        return opus;
+    }
+
+    public void MergeIntoFile(XElement file, XMLRootDocument document) {
+        if (file.Element("kommentare") == null)
+            file.AddFirst(new XElement("kommentare"));
+        file.Element("kommentare")!.AddFirst(document.Root);
+    }
+
+}