How can I create my own installer environment variables?
You can create custom environment installer variables using a <setInstallerVariable> action. For example:
<setInstallerVariable>
<name>serverport</name>
<value>3306</value>
</setInstallerVariable>
The code above will create an installer environment variable called serverport , which can later be referred to as ${serverport}. Wherever it appears, it will be substituted for its value during installation.