Added Classes for detecting Root Elements of Hamann-Collections

HaWeb/Settings/XMLRoots/CommentRoot.cs

@@ -0,0 +1,36 @@
+namespace HaWeb.Settings.XMLRoots;
+using System.Xml.Linq;
+using HaWeb.XMLParser;
+
+public class CommentRoot : HaWeb.XMLParser.IXMLRoot {
+    public string Type { get; } = "Register";
+    public string Container { get; } = "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, Container);
+    }
+
+    public bool Replaces(XMLRootDocument doc1, XMLRootDocument doc2) {
+        return true;
+    }
+
+}