A '''language-based system''' is a type of [[operating system]] that uses uses [[programming language|language]] features to provide security, instead of or in addition to hardware mechanisms. In such systems, code referred to as the ''trusted base'' is responsible for approving programs for [[execution (computing)|execution]], assuring they cannot perform operations detrimental to the system's stability without first being detected and dealt with.<ref name="Schneider">[http://www.cs.cmu.edu/~rwh/papers/langsec/dagstuhl.pdf A Language-Based Approach to Security], Schneider F., Morrissett G. (Cornell University) and Harper R. (Carnegie Mellon University). Informatics: 10 Years Back, 10 Years Ahead. (2000)</ref> A very common strategy of guaranteeing such operations are impossible is to base the system around a [[High-level programming language|high-level language]], such as [[Java (programming language)|Java]], whose design precludes dangerous constructs; many are entirely written in such a language, with only the minimum amount of [[low-level programming language|low-level code]] being used.<ref>{{cite web|
title=JX - A flexible Java Operating System (poster)|
