Sybase ADAPTIVE 15.0.2 - Manual (Page 54)

Installing version 15.0.2 over an existing 15.x Adaptive Server
38 Adaptive Server Enterprise
You can downgrade to earlier 15.x versions of Adaptive Server, but to do so
you must take the precautions described in the technical note before using any
of the new 15.0.2 features.
XML Services in Adaptive Server version 15.0.2
If you are planning on using XML in Adaptive Server version 15.0.2, there are
installation issues you must take into consideration. See “Appendix E:
Migrating Between the Java-based XQL Processor and the Native XML
Processor” in XML Services in Adaptive Server Enterprise.