private boolean allowEnvFunction = true;
public FunctionTree getSystemFunctions() {
if(systemFunctionTree == null) {
// Create the system source and add it to the source list
SystemSource systemSource = new SystemSource(this.allowEnvFunction);
// Validate the system source - should never fail
ActivityReport report = new ActivityReport("Function Validation"); //$NON-NLS-1$
validateSource(systemSource, report);
if(report.hasItems()) {