diff -r 82ba555a97d1 -r 13a41e435ea0 src/relpipe-out-xml.cpp
--- a/src/relpipe-out-xml.cpp	Sun Sep 16 14:39:10 2018 +0200
+++ b/src/relpipe-out-xml.cpp	Sun Sep 16 18:12:31 2018 +0200
@@ -1,4 +1,5 @@
 #include <cstdlib>
+#include <unistd.h>
 #include <memory>
 
 #include <relpipe/cli/CLI.h>
@@ -19,6 +20,11 @@
 	int resultCode = CLI::EXIT_CODE_UNEXPECTED_ERROR;
 
 	try {
+
+		// TODO: color syntax highlighting if stdout is TTY:
+		// if (isatty(fileno(stdout))) std::cout << "color" << std::endl;
+		// else std::cout << "no-color" << std::endl;
+
 		std::shared_ptr<RelationalReader> reader(Factory::create(std::cin));
 		XmlHandler handler(std::cout);
 		reader->addHandler(&handler);