* be read and updated. Only the initial declaration that needs to be done via the namespace.
 *
 * <pre>
 * project.ext.prop1 = "foo"
 * task doStuff {
 *     ext.prop2 = "bar"
 * }
 * subprojects { ext.${prop3} = false }
 * </pre>
 *
 * Reading extra properties is done through the &quot;ext&quot; or through the owning object.
 *
 * <pre>