--- a/mde/mergetag/exception.d	Sat Nov 03 16:06:06 2007 +0000
+++ b/mde/mergetag/exception.d	Sun Jan 06 17:38:51 2008 +0000
@@ -20,21 +20,46 @@
     this () {}
 }
 
-/** Thrown onunknown format errors; when reading or writing and the filetype cannot be guessed. */
+/** Thrown on unknown format errors; when reading or writing and the filetype cannot be guessed. */
 class MTFileFormatException : MTException {
     this () {}
 }
 
 /** Thrown when a string ID is parsed but cannot be found in the lookup table, hence cannot be used
  * as an ID. It should always be caught and handled gracefully (by ignoring the tag or section
- * involved).
- */
+ * involved). */
 class MTStringIDException : MTException {
     this () {}
 }
 
-/** Thrown by classes implementing DataSection when addTag is called with an unrecognised type string.
- */
+/** Thrown by addTag (in classes implementing dataset.DataSection) when a tag is read with an
+ * unrecognised type field. */
 class MTUnknownTypeException : MTException {
     this () {}
+    this (char[] msg) {
+        super (msg);
+    }
 }
+
+/** Thrown by addTag (in classes implementing dataset.DataSection) when a data parsing error occurs
+* (really just to make whoever called addTag to log a warning saying where the error occured). */
+class MTaddTagParseException : MTException {
+    this () {}
+}
+
+/// Thrown by TypeView.parse on errors.
+class MTBadTypeStringException : MTException {
+    this () {}
+}
+
+/// Thrown by TextWriter.indexTable (only in debug mode).
+class MTBadIDStringException : MTException {
+    this () {}
+}
+
+/// Thrown by *Writer.write.
+class MTNoDataSetException : MTException {
+    this (char[] msg) {
+        super(msg);
+    }
+}