Reserved Package Names
In any interoperability-enabled namespace, avoid using the following package names: Demo, Ens, EnsLib, EnsPortal, or CSPX. These packages are completely replaced during the upgrade process. If you define classes in these packages, you would need to export the classes before upgrading and then import them after upgrading.
Also, InterSystems recommends that you avoid using any package names that start with Ens (case-sensitive). There are two reasons for this recommendation:
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When you compile classes in packages with names that start with Ens, the compiler writes the generated routines into the ENSLIB system database. (The compiler does this because all routines with names that start with Ens are mapped to that database.) This means that when you upgrade the instance, thus replacing the ENSLIB database, the upgrade removes the generated routines, leaving only the class definitions. At this point, in order to use the classes, it is necessary to recompile them.
In contrast, when you upgrade the instance, it is not necessary to recompile classes in packages with names that do not start with Ens.
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If you define classes in packages with names that start with Ens, they are available in all interoperability-enabled namespaces, which may or may not be desirable. One consequence is that it is not possible to have two classes with the same name and different contents in different interoperability-enabled namespaces, if the package name starts with Ens.
