Start adding currently-unused models

SabreTools.Models/Listxml/Condition.cs

@@ -0,0 +1,22 @@
+using System.Xml;
+using System.Xml.Serialization;
+
+namespace SabreTools.Models.Listxml
+{
+    [XmlRoot("condition")]
+    public class Condition
+    {
+        [XmlAttribute("tag")]
+        public string Tag { get; set; }
+
+        [XmlAttribute("mask")]
+        public string Mask { get; set; }
+
+        /// <remarks>(eq|ne|gt|le|lt|ge)</remarks>
+        [XmlAttribute("relation")]
+        public string Relation { get; set; }
+
+        [XmlAttribute("value")]
+        public string Value { get; set; }
+    }
+}