more work on grammars and refs/defs augmented/updated the regression tests

* relaxng: more work on grammars and refs/defs
* test/relaxng/* result/relaxng/*: augmented/updated the
  regression tests
Daniel
diff --git a/test/relaxng/table.rng b/test/relaxng/table.rng
new file mode 100644
index 0000000..c14e603
--- /dev/null
+++ b/test/relaxng/table.rng
@@ -0,0 +1,21 @@
+<grammar xmlns="http://relaxng.org/ns/structure/1.0">
+
+<define name="cell.content">
+  <notAllowed/>
+</define>
+
+<start>
+  <element name="table">
+    <oneOrMore>
+      <element name="tr">
+        <oneOrMore>
+	  <element name="td">
+	    <ref name="cell.content"/>
+	  </element>
+        </oneOrMore>
+      </element>
+    </oneOrMore>
+  </element>
+</start>
+
+</grammar>