Added regression a test provided by Heiko Oberdiek (bug #303566).

* test/schemas/bug303566_1* result/schemas/bug303566_1_1*:
  Added regression a test provided by Heiko Oberdiek (bug #303566).

  level for XML Schema IDCs (bug #303566 reported by Heiko Oberdiek).
  This should not affect pattern-like resolution on every level.
diff --git a/result/schemas/bug303566_1_1 b/result/schemas/bug303566_1_1
new file mode 100644
index 0000000..8092bf0
--- /dev/null
+++ b/result/schemas/bug303566_1_1
@@ -0,0 +1 @@
+./test/schemas/bug303566_1.xml fails to validate