Symantec WINDOWS INSTALLER EDITOR 7.0 SP2 - REFERENCE FOR WISE INSTALLATION STUDIO V1.0 Installation Manual page 113

Defining an Installation Project
assigned to the Core feature. Because they are siblings of the Core feature, an end user
might install the text editor feature or the graphics editor feature without installing the
core feature, which would break the installation. To avoid this problem, make the Core
feature required; double-click it and mark the Required Feature check box on the
Feature Details dialog box. Required features cannot be turned off during installation.
The advantage to this strategy is that during installation, the end user sees the optional
features at the top level instead of buried in the tree structure.
Place stand-alone features as siblings
The features External_Text_Editor and External_Graphics_Editor are stand-alone
applications, which can run independently of the core application. Therefore, you can
make them siblings of the Core feature. An end user can install the text editor or the
graphics editor without the core application.
Independent of Core feature
Use conditions with features
The Core feature has two conditions. VersionNT specifies that the operating system must
be later than Windows Me, and Version9x specifies that the operating system must be
Windows 95/98/Me. Because conditions appear in the Current Feature drop-down list,
which appears on most Installation Expert pages, you can associate the same kinds of
items with a condition that you can with a feature, including files, registry entries,
shortcuts, services, and so on. Any items that you associate with either condition are
installed only if the feature is installed and the condition is true.
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