ValidationPreference dqStringNotRequiredVariable = advisor.dqStringNotRequiredVariable();
SINGLE_INTERPOLATION: if(dqStringNotRequiredVariable.isWarningOrError()) {
if(o.getStringPart().size() == 1) {
String replacement = null;
TextExpression te = o.getStringPart().get(0);
switch(te.eClass().getClassifierID()) {
case PPPackage.VARIABLE_TE:
replacement = ((VariableTE) te).getVarName();
break;
case PPPackage.EXPRESSION_TE:
Expression expr = ((ExpressionTE) te).getExpression();