SELinux/Language

SELinux has a very extensive language in which policies and SELinux enforcement behavior can be defined and controlled.

Resources

 * Officla SELinux project wiki which contains detailed information about SELinux policy statements
 * SELinux Notebook - The Foundations, an excellent resource for SELinux policy language and constructs (do not consider the date at the beginning, the book is often updated which can be seen through the comments below)