Possible compatibility problems with earlier versions marked with '*'.
---- XXXXXX XXXX/XX/XX
+--- 1.0pl4 1996/1/24
+
+Added Sort PDU.
+
+Fixed small problem in SUTRS-filter. A newline was sometimes inserted before
+the rank and record number.
+
+Adjustments to the frontend server.
+
+Fixed diagnostic BER dumper. It ignored the file argument.
+
+--- 1.0pl3 1996/1/2
Various changes to retrieval module.
Changed the union discriminators of the protocol files from enums to
ints paired with #defines.
-Improved Explain decoders/encoders.
+*Changed oident.class to oident.oclass to avoid a reserved word in C++
+ compilers.
+
+*Changed operator in the RPN structure to 'roperator', again to avoid a
+ conflict with C++.
+
+Fixed problems in Explain decoders/encoders.
--- 1.0pl2 1995/12/6