in core/src/main/java/org/apache/jsieve/SieveValidationVisitor.java [149:157]
public Object visit(ASTstring node, Object data) throws SieveException {
if (isInRequire) {
requirements(node);
}
if (isInComparatorNameArgument) {
comparatorNameArgument(node);
}
return visitNode(node, data);
}