+ "as", //$NON-NLS-1$
+ "forall", //$NON-NLS-1$
+ "rule", //$NON-NLS-1$
+ "ruleset", //$NON-NLS-1$
+ "constraint", //$NON-NLS-1$
+ "extends", //$NON-NLS-1$
+ "by", //$NON-NLS-1$
+ "select", //$NON-NLS-1$
+ "enforce", //$NON-NLS-1$
+ "transformation", //$NON-NLS-1$
+ "when" //$NON-NLS-1$