more work on Relax-NG augmented/updated the regression tests Daniel

* relaxng.c: more work on Relax-NG
* test/relaxng/* result/relaxng/*: augmented/updated the
  regression tests
Daniel
diff --git a/test/relaxng/tutor6_2_1.xml b/test/relaxng/tutor6_2_1.xml
new file mode 100644
index 0000000..5064bf2
--- /dev/null
+++ b/test/relaxng/tutor6_2_1.xml
@@ -0,0 +1,5 @@
+<card>
+  <name>John Smith</name>
+  <email>js@example.com</email>
+  <preferredFormat>text</preferredFormat>
+</card>