Use Logiqx serializer for reading only

SabreTools.Models/Logiqx/SoftwareList.cs

@@ -4,7 +4,7 @@ using System.Xml.Serialization;
 namespace SabreTools.Models.Logiqx
 {
     [XmlRoot("softwarelist")]
-    public class SoftwareList : ItemBase
+    public class SoftwareList
     {
         [XmlAttribute("tag")]
         public string Tag { get; set; }
@@ -18,5 +18,17 @@ namespace SabreTools.Models.Logiqx
 
         [XmlAttribute("filter")]
         public string? Filter { get; set; }
+        
+        #region DO NOT USE IN PRODUCTION
+
+        /// <remarks>Should be empty</remarks>
+        [XmlAnyAttribute]
+        public XmlAttribute[]? ADDITIONAL_ATTRIBUTES { get; set; }
+
+        /// <remarks>Should be empty</remarks>
+        [XmlAnyElement]
+        public object[]? ADDITIONAL_ELEMENTS { get; set; }
+
+        #endregion
     }
 }