Resource modeling tooling comes with SML editor, and validator. SML validator validates SML and SML-IF files.
After downloading these packages, unzip them to same directory. If Eclipse is already installed in the user environment, then it is important that you do not choose a different folder, as the zip file includes path information so that the feature and plug-in files are installed in the correct folders.
Restart the Eclipse workbench (if it is already running) to activate the new plug-ins. To do this, select File, Restart from the Workbench menu.