What is the default value of the warSourceDirectory configuration property of the Maven WAR Plugin?

When building a Maven Archetype, where do you put your prototype files?

If you wish to build and package your artifact using the Maven package goal but don't want to execute the unit tests, which environment variable and value would you use?

What element in the pom.xml file allows you to provide values that can be reused in other elements of the pom.xml?