return getSelectorName(lower.getOperand());
} else if (operand instanceof NodeLocalName) {
NodeLocalName local = (NodeLocalName) operand;
return local.getSelectorName();
} else if (operand instanceof NodeName) {
NodeName name = (NodeName) operand;
return name.getSelectorName();
} else if (operand instanceof PropertyValue) {
PropertyValue value = (PropertyValue) operand;
return value.getSelectorName();
} else if (operand instanceof UpperCase) {
UpperCase upper = (UpperCase) operand;