Fix bug #4502
Further fix for bug #4246
Fix bug 4254
Changes needed to support XX compiler
Support code for alphacode type representation in XX compiler
Fix bug #4091 (empty-sequence() and xs:error?)
Fix bug 4110 (whitespace in PIs)
HE preprocessor directives added
Support code for export to Saxon-JS2 format SEF files
Further fixes for bug #4067 - displaying local variables in stack trace
Fix bug 4069 (surrogate pair in input to xs:base64Binary())
Bug 4068 - ISO week numbers
Improved error diagnostics from saxon:tabulate-maps (more tests added). No bug entry.
Improve Javadoc documentation, remove TODO comment. No bug entry.
Fix bug 4027 - round() and round-half-to-even() with very large scale
See bug 4002: remove resididual traces of an abandoned design for regular expressions
Bug #3982 - Generics. Declare Sequence as Sequence<> throughout.
Bug #3982 - Generics. Now down to 1798 warnings.
Further fixes for bug #3982 (eliminate "unchecked" warnings for generic types)
Fix bug 3982 (Item<?> vs Item)
Added baseline Saxon 9.9 to archive opensource repository
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