Possible compatibility problems with earlier versions marked with '*'.
+Implemented sub-tree feature for schemas. Sub-trees are
+referenced in *.abs-files. See explain.abs for an example
+of the use of this feature.
+
+Modified bib1.att; local attributes for ANY didn't include
+ANY itself (only affects use of the retrieval module).
+
Fixed bug in plain SGML reader in function data1_read_node:
tags with prefix "var" was incorrectly interpreted as variants.