It specifies whether to show ZK version on each page.
By default, each page will display the comment containing ZK version which the current web application is using. If a user wants to hide the info in security consideration, he can specify this library property as
Break Browser Cache
The value other than
true is considered
false. And this value will be taken as salt to obfuscate the version info which is needed in resource caching. For instance, "zk_is_good" can be used to hide the version info and obfuscate it when needed.