diff --git a/SabreTools.DatFiles/DatFile.cs b/SabreTools.DatFiles/DatFile.cs
index 03981cd6..68d84814 100644
--- a/SabreTools.DatFiles/DatFile.cs
+++ b/SabreTools.DatFiles/DatFile.cs
@@ -511,9 +511,6 @@ namespace SabreTools.DatFiles
         /// Return list of required fields missing from a DatItem
         /// </summary>
         /// <returns>List of missing required fields, null or empty if none were found</returns>
-        /// <remarks>
-        /// TODO: Implement this in all relevant DatFile types
-        /// </remarks>
         protected virtual List<DatItemField> GetMissingRequiredFields(DatItem datItem) => null;
 
         /// <summary>
diff --git a/SabreTools.DatFiles/Formats/ArchiveDotOrg.cs b/SabreTools.DatFiles/Formats/ArchiveDotOrg.cs
index bb1c5909..e035adb5 100644
--- a/SabreTools.DatFiles/Formats/ArchiveDotOrg.cs
+++ b/SabreTools.DatFiles/Formats/ArchiveDotOrg.cs
@@ -1,9 +1,9 @@
 using System;
+using System.Collections.Generic;
 using System.IO;
 using System.Text;
 using System.Xml;
 using System.Xml.Schema;
-
 using SabreTools.Core;
 using SabreTools.Core.Tools;
 using SabreTools.DatItems;
@@ -15,9 +15,6 @@ namespace SabreTools.DatFiles.Formats
     /// <summary>
     /// Represents parsing and writing of a Archive.org file list
     /// </summary>
-    /// <remarks>
-    /// TODO: Check and enforce required fields in output
-    /// </remarks>
     internal class ArchiveDotOrg : DatFile
     {
         /// <summary>
@@ -268,6 +265,13 @@ namespace SabreTools.DatFiles.Formats
             };
         }
 
+        /// <inheritdoc/>
+        protected override List<DatItemField> GetMissingRequiredFields(DatItem datItem)
+        {
+            // TODO: Check required fields
+            return null;
+        }
+
         /// <inheritdoc/>
         public override bool WriteToFile(string outfile, bool ignoreblanks = false, bool throwOnError = false)
         {
diff --git a/SabreTools.DatFiles/Formats/AttractMode.cs b/SabreTools.DatFiles/Formats/AttractMode.cs
index d9950f4b..04291079 100644
--- a/SabreTools.DatFiles/Formats/AttractMode.cs
+++ b/SabreTools.DatFiles/Formats/AttractMode.cs
@@ -1,7 +1,7 @@
 using System;
+using System.Collections.Generic;
 using System.IO;
 using System.Text;
-
 using SabreTools.Core;
 using SabreTools.DatItems;
 using SabreTools.DatItems.Formats;
@@ -14,9 +14,6 @@ namespace SabreTools.DatFiles.Formats
     /// <summary>
     /// Represents parsing and writing of an AttractMode DAT
     /// </summary>
-    /// <remarks>
-    /// TODO: Check and enforce required fields in output
-    /// </remarks>
     internal class AttractMode : DatFile
     {
         /// <summary>
@@ -115,6 +112,13 @@ namespace SabreTools.DatFiles.Formats
             return new ItemType[] { ItemType.Rom };
         }
 
+        /// <inheritdoc/>
+        protected override List<DatItemField> GetMissingRequiredFields(DatItem datItem)
+        {
+            // TODO: Check required fields
+            return null;
+        }
+
         /// <inheritdoc/>
         public override bool WriteToFile(string outfile, bool ignoreblanks = false, bool throwOnError = false)
         {
diff --git a/SabreTools.DatFiles/Formats/ClrMamePro.cs b/SabreTools.DatFiles/Formats/ClrMamePro.cs
index e1b4a487..1065f6b1 100644
--- a/SabreTools.DatFiles/Formats/ClrMamePro.cs
+++ b/SabreTools.DatFiles/Formats/ClrMamePro.cs
@@ -1,7 +1,7 @@
 using System;
+using System.Collections.Generic;
 using System.IO;
 using System.Text;
-
 using SabreTools.Core;
 using SabreTools.Core.Tools;
 using SabreTools.DatItems;
@@ -15,9 +15,6 @@ namespace SabreTools.DatFiles.Formats
     /// <summary>
     /// Represents parsing and writing of a ClrMamePro DAT
     /// </summary>
-    /// <remarks>
-    /// TODO: Check and enforce required fields in output
-    /// </remarks>
     internal class ClrMamePro : DatFile
     {
         #region Fields
@@ -436,6 +433,13 @@ namespace SabreTools.DatFiles.Formats
             };
         }
 
+        /// <inheritdoc/>
+        protected override List<DatItemField> GetMissingRequiredFields(DatItem datItem)
+        {
+            // TODO: Check required fields
+            return null;
+        }
+
         /// <inheritdoc/>
         public override bool WriteToFile(string outfile, bool ignoreblanks = false, bool throwOnError = false)
         {
diff --git a/SabreTools.DatFiles/Formats/DosCenter.cs b/SabreTools.DatFiles/Formats/DosCenter.cs
index 1c4ca196..00fc461e 100644
--- a/SabreTools.DatFiles/Formats/DosCenter.cs
+++ b/SabreTools.DatFiles/Formats/DosCenter.cs
@@ -3,7 +3,6 @@ using System.Collections.Generic;
 using System.IO;
 using System.Linq;
 using System.Text;
-
 using SabreTools.Core;
 using SabreTools.Core.Tools;
 using SabreTools.DatItems;
@@ -17,9 +16,6 @@ namespace SabreTools.DatFiles.Formats
     /// <summary>
     /// Represents parsing and writing of a DosCenter DAT
     /// </summary>
-    /// <remarks>
-    /// TODO: Check and enforce required fields in output
-    /// </remarks>
     internal class DosCenter : DatFile
     {
         /// <summary>
@@ -262,6 +258,13 @@ namespace SabreTools.DatFiles.Formats
             return new ItemType[] { ItemType.Rom };
         }
 
+        /// <inheritdoc/>
+        protected override List<DatItemField> GetMissingRequiredFields(DatItem datItem)
+        {
+            // TODO: Check required fields
+            return null;
+        }
+
         /// <inheritdoc/>
         public override bool WriteToFile(string outfile, bool ignoreblanks = false, bool throwOnError = false)
         {
diff --git a/SabreTools.DatFiles/Formats/EverdriveSmdb.cs b/SabreTools.DatFiles/Formats/EverdriveSmdb.cs
index 37479259..8949653e 100644
--- a/SabreTools.DatFiles/Formats/EverdriveSmdb.cs
+++ b/SabreTools.DatFiles/Formats/EverdriveSmdb.cs
@@ -1,7 +1,7 @@
 using System;
+using System.Collections.Generic;
 using System.IO;
 using System.Text;
-
 using SabreTools.Core;
 using SabreTools.Core.Tools;
 using SabreTools.DatItems;
@@ -15,9 +15,6 @@ namespace SabreTools.DatFiles.Formats
     /// <summary>
     /// Represents parsing and writing of an Everdrive SMDB file
     /// </summary>
-    /// <remarks>
-    /// TODO: Check and enforce required fields in output
-    /// </remarks>
     internal class EverdriveSMDB : DatFile
     {
         /// <summary>
@@ -112,6 +109,13 @@ namespace SabreTools.DatFiles.Formats
             return new ItemType[] { ItemType.Rom };
         }
 
+        /// <inheritdoc/>
+        protected override List<DatItemField> GetMissingRequiredFields(DatItem datItem)
+        {
+            // TODO: Check required fields
+            return null;
+        }
+
         /// <inheritdoc/>
         public override bool WriteToFile(string outfile, bool ignoreblanks = false, bool throwOnError = false)
         {
diff --git a/SabreTools.DatFiles/Formats/Listrom.cs b/SabreTools.DatFiles/Formats/Listrom.cs
index 6dde8af5..13675d66 100644
--- a/SabreTools.DatFiles/Formats/Listrom.cs
+++ b/SabreTools.DatFiles/Formats/Listrom.cs
@@ -1,8 +1,8 @@
 using System;
+using System.Collections.Generic;
 using System.IO;
 using System.Text;
 using System.Text.RegularExpressions;
-
 using SabreTools.Core;
 using SabreTools.Core.Tools;
 using SabreTools.DatItems;
@@ -14,9 +14,6 @@ namespace SabreTools.DatFiles.Formats
     /// <summary>
     /// Represents parsing and writing of a MAME Listrom DAT
     /// </summary>
-    /// <remarks>
-    /// TODO: Check and enforce required fields in output
-    /// </remarks>
     internal class Listrom : DatFile
     {
         /// <summary>
@@ -261,6 +258,13 @@ namespace SabreTools.DatFiles.Formats
             return new ItemType[] { ItemType.Disk, ItemType.Rom };
         }
 
+        /// <inheritdoc/>
+        protected override List<DatItemField> GetMissingRequiredFields(DatItem datItem)
+        {
+            // TODO: Check required fields
+            return null;
+        }
+
         /// <inheritdoc/>
         public override bool WriteToFile(string outfile, bool ignoreblanks = false, bool throwOnError = false)
         {
diff --git a/SabreTools.DatFiles/Formats/Listxml.cs b/SabreTools.DatFiles/Formats/Listxml.cs
index 611b5956..f2827434 100644
--- a/SabreTools.DatFiles/Formats/Listxml.cs
+++ b/SabreTools.DatFiles/Formats/Listxml.cs
@@ -5,7 +5,6 @@ using System.Linq;
 using System.Text;
 using System.Xml;
 using System.Xml.Schema;
-
 using SabreTools.Core;
 using SabreTools.Core.Tools;
 using SabreTools.DatItems;
@@ -1349,6 +1348,13 @@ namespace SabreTools.DatFiles.Formats
             };
         }
 
+        /// <inheritdoc/>
+        protected override List<DatItemField> GetMissingRequiredFields(DatItem datItem)
+        {
+            // TODO: Check required fields
+            return null;
+        }
+
         /// <inheritdoc/>
         public override bool WriteToFile(string outfile, bool ignoreblanks = false, bool throwOnError = false)
         {
diff --git a/SabreTools.DatFiles/Formats/Logiqx.cs b/SabreTools.DatFiles/Formats/Logiqx.cs
index c77a06eb..62c61837 100644
--- a/SabreTools.DatFiles/Formats/Logiqx.cs
+++ b/SabreTools.DatFiles/Formats/Logiqx.cs
@@ -6,7 +6,6 @@ using System.Text;
 using System.Text.RegularExpressions;
 using System.Xml;
 using System.Xml.Schema;
-
 using SabreTools.Core;
 using SabreTools.Core.Tools;
 using SabreTools.DatItems;
@@ -18,9 +17,6 @@ namespace SabreTools.DatFiles.Formats
     /// <summary>
     /// Represents parsing and writing of a Logiqx-derived DAT
     /// </summary>
-    /// <remarks>
-    /// TODO: Check and enforce required fields in output
-    /// </remarks>
     internal class Logiqx : DatFile
     {
         // Private instance variables specific to Logiqx DATs
@@ -776,6 +772,13 @@ namespace SabreTools.DatFiles.Formats
             };
         }
 
+        /// <inheritdoc/>
+        protected override List<DatItemField> GetMissingRequiredFields(DatItem datItem)
+        {
+            // TODO: Check required fields
+            return null;
+        }
+
         /// <inheritdoc/>
         public override bool WriteToFile(string outfile, bool ignoreblanks = false, bool throwOnError = false)
         {
diff --git a/SabreTools.DatFiles/Formats/Missfile.cs b/SabreTools.DatFiles/Formats/Missfile.cs
index aede8c8b..56029481 100644
--- a/SabreTools.DatFiles/Formats/Missfile.cs
+++ b/SabreTools.DatFiles/Formats/Missfile.cs
@@ -1,7 +1,7 @@
 using System;
+using System.Collections.Generic;
 using System.IO;
 using System.Text;
-
 using SabreTools.Core;
 using SabreTools.DatItems;
 
@@ -10,9 +10,6 @@ namespace SabreTools.DatFiles.Formats
     /// <summary>
     /// Represents parsing and writing of a Missfile
     /// </summary>
-    /// <remarks>
-    /// TODO: Check and enforce required fields in output
-    /// </remarks>
     internal class Missfile : DatFile
     {
         /// <summary>
@@ -31,6 +28,13 @@ namespace SabreTools.DatFiles.Formats
             throw new NotImplementedException();
         }
 
+        /// <inheritdoc/>
+        protected override List<DatItemField> GetMissingRequiredFields(DatItem datItem)
+        {
+            // TODO: Check required fields
+            return null;
+        }
+
         /// <inheritdoc/>
         public override bool WriteToFile(string outfile, bool ignoreblanks = false, bool throwOnError = false)
         {
diff --git a/SabreTools.DatFiles/Formats/OfflineList.cs b/SabreTools.DatFiles/Formats/OfflineList.cs
index 1173e201..6958d6aa 100644
--- a/SabreTools.DatFiles/Formats/OfflineList.cs
+++ b/SabreTools.DatFiles/Formats/OfflineList.cs
@@ -4,7 +4,6 @@ using System.IO;
 using System.Text;
 using System.Xml;
 using System.Xml.Schema;
-
 using SabreTools.Core;
 using SabreTools.Core.Tools;
 using SabreTools.DatItems;
@@ -16,9 +15,6 @@ namespace SabreTools.DatFiles.Formats
     /// <summary>
     /// Represents parsing and writing of an OfflineList XML DAT
     /// </summary>
-    /// <remarks>
-    /// TODO: Check and enforce required fields in output
-    /// </remarks>
     internal class OfflineList : DatFile
     {
         /// <summary>
@@ -665,6 +661,13 @@ namespace SabreTools.DatFiles.Formats
             return new ItemType[] { ItemType.Rom };
         }
 
+        /// <inheritdoc/>
+        protected override List<DatItemField> GetMissingRequiredFields(DatItem datItem)
+        {
+            // TODO: Check required fields
+            return null;
+        }
+
         /// <inheritdoc/>
         public override bool WriteToFile(string outfile, bool ignoreblanks = false, bool throwOnError = false)
         {
diff --git a/SabreTools.DatFiles/Formats/OpenMSX.cs b/SabreTools.DatFiles/Formats/OpenMSX.cs
index cc89427a..9016f3f8 100644
--- a/SabreTools.DatFiles/Formats/OpenMSX.cs
+++ b/SabreTools.DatFiles/Formats/OpenMSX.cs
@@ -4,7 +4,6 @@ using System.IO;
 using System.Text;
 using System.Xml;
 using System.Xml.Schema;
-
 using SabreTools.Core;
 using SabreTools.Core.Tools;
 using SabreTools.DatItems;
@@ -16,9 +15,6 @@ namespace SabreTools.DatFiles.Formats
     /// <summary>
     /// Represents parsing and writing of a openMSX softawre list XML DAT
     /// </summary>
-    /// <remarks>
-    /// TODO: Check and enforce required fields in output
-    /// </remarks>
     internal class OpenMSX : DatFile
     {
         /// <summary>
@@ -538,6 +534,13 @@ namespace SabreTools.DatFiles.Formats
             return new ItemType[] { ItemType.Rom };
         }
 
+        /// <inheritdoc/>
+        protected override List<DatItemField> GetMissingRequiredFields(DatItem datItem)
+        {
+            // TODO: Check required fields
+            return null;
+        }
+
         /// <inheritdoc/>
         public override bool WriteToFile(string outfile, bool ignoreblanks = false, bool throwOnError = false)
         {
diff --git a/SabreTools.DatFiles/Formats/RomCenter.cs b/SabreTools.DatFiles/Formats/RomCenter.cs
index f27b3ce7..9b69873f 100644
--- a/SabreTools.DatFiles/Formats/RomCenter.cs
+++ b/SabreTools.DatFiles/Formats/RomCenter.cs
@@ -2,7 +2,6 @@
 using System.Collections.Generic;
 using System.IO;
 using System.Text;
-
 using SabreTools.Core;
 using SabreTools.Core.Tools;
 using SabreTools.DatItems;
@@ -15,9 +14,6 @@ namespace SabreTools.DatFiles.Formats
     /// <summary>
     /// Represents parsing and writing of a RomCenter DAT
     /// </summary>
-    /// <remarks>
-    /// TODO: Check and enforce required fields in output
-    /// </remarks>
     internal class RomCenter : DatFile
     {
         /// <summary>
@@ -367,6 +363,13 @@ namespace SabreTools.DatFiles.Formats
             return new ItemType[] { ItemType.Rom };
         }
 
+        /// <inheritdoc/>
+        protected override List<DatItemField> GetMissingRequiredFields(DatItem datItem)
+        {
+            // TODO: Check required fields
+            return null;
+        }
+
         /// <inheritdoc/>
         public override bool WriteToFile(string outfile, bool ignoreblanks = false, bool throwOnError = false)
         {
diff --git a/SabreTools.DatFiles/Formats/SabreJSON.cs b/SabreTools.DatFiles/Formats/SabreJSON.cs
index 9ed7a8c1..ca6b7b6a 100644
--- a/SabreTools.DatFiles/Formats/SabreJSON.cs
+++ b/SabreTools.DatFiles/Formats/SabreJSON.cs
@@ -3,14 +3,13 @@ using System.Collections.Generic;
 using System.IO;
 using System.Linq;
 using System.Text;
-
+using Newtonsoft.Json;
+using Newtonsoft.Json.Linq;
+using Newtonsoft.Json.Serialization;
 using SabreTools.Core;
 using SabreTools.Core.Tools;
 using SabreTools.DatItems;
 using SabreTools.DatItems.Formats;
-using Newtonsoft.Json;
-using Newtonsoft.Json.Linq;
-using Newtonsoft.Json.Serialization;
 
 namespace SabreTools.DatFiles.Formats
 {
diff --git a/SabreTools.DatFiles/Formats/SabreXML.cs b/SabreTools.DatFiles/Formats/SabreXML.cs
index c1ec5d70..625aecf0 100644
--- a/SabreTools.DatFiles/Formats/SabreXML.cs
+++ b/SabreTools.DatFiles/Formats/SabreXML.cs
@@ -4,7 +4,6 @@ using System.Text;
 using System.Xml;
 using System.Xml.Schema;
 using System.Xml.Serialization;
-
 using SabreTools.Core;
 using SabreTools.DatItems;
 
diff --git a/SabreTools.DatFiles/Formats/SeparatedValue.cs b/SabreTools.DatFiles/Formats/SeparatedValue.cs
index 23124615..be8dc4c0 100644
--- a/SabreTools.DatFiles/Formats/SeparatedValue.cs
+++ b/SabreTools.DatFiles/Formats/SeparatedValue.cs
@@ -1,7 +1,7 @@
 using System;
+using System.Collections.Generic;
 using System.IO;
 using System.Text;
-
 using SabreTools.Core;
 using SabreTools.Core.Tools;
 using SabreTools.DatItems;
@@ -15,9 +15,6 @@ namespace SabreTools.DatFiles.Formats
     /// <summary>
     /// Represents parsing and writing of a value-separated DAT
     /// </summary>
-    /// <remarks>
-    /// TODO: Check and enforce required fields in output
-    /// </remarks>
     internal class SeparatedValue : DatFile
     {
         // Private instance variables specific to Separated Value DATs
@@ -98,6 +95,13 @@ namespace SabreTools.DatFiles.Formats
             return new ItemType[] { ItemType.Disk, ItemType.Media, ItemType.Rom };
         }
 
+        /// <inheritdoc/>
+        protected override List<DatItemField> GetMissingRequiredFields(DatItem datItem)
+        {
+            // TODO: Check required fields
+            return null;
+        }
+
         /// <inheritdoc/>
         public override bool WriteToFile(string outfile, bool ignoreblanks = false, bool throwOnError = false)
         {
diff --git a/SabreTools.DatFiles/Formats/SoftwareList.cs b/SabreTools.DatFiles/Formats/SoftwareList.cs
index dd4dc465..864d36d8 100644
--- a/SabreTools.DatFiles/Formats/SoftwareList.cs
+++ b/SabreTools.DatFiles/Formats/SoftwareList.cs
@@ -5,7 +5,6 @@ using System.Linq;
 using System.Text;
 using System.Xml;
 using System.Xml.Schema;
-
 using SabreTools.Core;
 using SabreTools.Core.Tools;
 using SabreTools.DatItems;
@@ -26,6 +25,9 @@ namespace SabreTools.DatFiles.Formats
         /// <summary>
         /// DTD for original MAME Software List DATs
         /// </summary>
+        /// <remarks>
+        /// TODO: See if there's an updated DTD and then check for required fields
+        /// </remarks>
         private const string SoftwareListDTD = @"<!ELEMENT softwarelist (software+)>
     <!ATTLIST softwarelist name CDATA #REQUIRED>
     <!ATTLIST softwarelist description CDATA #IMPLIED>
@@ -585,6 +587,13 @@ namespace SabreTools.DatFiles.Formats
             };
         }
 
+        /// <inheritdoc/>
+        protected override List<DatItemField> GetMissingRequiredFields(DatItem datItem)
+        {
+            // TODO: Check required fields
+            return null;
+        }
+
         /// <inheritdoc/>
         public override bool WriteToFile(string outfile, bool ignoreblanks = false, bool throwOnError = false)
         {