[324927] Do not serialize configurations that are contributed by Eclipse plug-ins.

Signed-off-by: Florian Thienel <florian@thienel.org>
diff --git a/sourceediting/tests/org.eclipse.wst.xml.vex.ui.tests/testdata/test.css b/sourceediting/tests/org.eclipse.wst.xml.vex.ui.tests/testdata/test.css
new file mode 100644
index 0000000..9a83031
--- /dev/null
+++ b/sourceediting/tests/org.eclipse.wst.xml.vex.ui.tests/testdata/test.css
@@ -0,0 +1,53 @@
+
+html {
+  display: block;
+}
+
+body {
+  display: block;
+}
+
+p {
+  display: block;
+}
+
+block {
+  display: block;
+}
+
+pre {
+  display: block;
+  white-space: pre;
+}
+
+
+/* Styles for positioning tests */
+root {
+  border: 3px 7px 11px 13px;
+  padding: 17px 19px 23px 29px;
+}
+
+small {
+  border-width: 1px 2px 3px 4px;
+  border-style: solid;
+  margin: 100px 200px 300px 400px;
+  padding: 10px 20px 30px 40px;
+  display: block;
+}
+
+medium {
+  border-width: 2px 4px 6px 8px;
+  border-style: solid;
+  margin: 200px 400px 600px 800px;
+  padding: 20px 40px 60px 80px;
+  display: block;
+}
+
+large {
+  border-width: 3px 6px 9px 12px;
+  border-style: solid;
+  margin: 300px 600px 900px 1200px;
+  padding: 30px 60px 90px 120px;
+  display: block;
+}
+
diff --git a/sourceediting/tests/org.eclipse.wst.xml.vex.ui.tests/testdata/test.dtd b/sourceediting/tests/org.eclipse.wst.xml.vex.ui.tests/testdata/test.dtd
new file mode 100644
index 0000000..f246a88
--- /dev/null
+++ b/sourceediting/tests/org.eclipse.wst.xml.vex.ui.tests/testdata/test.dtd
@@ -0,0 +1,10 @@
+<!ELEMENT any ANY>
+<!ELEMENT empty EMPTY>
+<!ELEMENT section (title?, para+)>
+<!ELEMENT para (#PCDATA | emphasis)*>
+<!ELEMENT title (#PCDATA)>
+<!ELEMENT emphasis (#PCDATA)>
+
+<!-- a dummy attribute, just to make sure attribute def serialization is OK -->
+<!ATTLIST section
+	name	CDATA	#IMPLIED>
\ No newline at end of file