add basic sample with one namespace

Author: jacalata

samples/preserve-namespaces/TABLEAU_10_TWB.twb

@@ -0,0 +1,22 @@
+<?xml version='1.0' encoding='utf-8' ?>
+<workbook source-build='0.0.0 (0000.16.0510.1300)' source-platform='mac' version='10.0'
+          xmlns:user='http://www.tableausoftware.com/xml/user'>
+    <datasources>
+        <datasource caption='xy+ (Multiple Connections)' inline='true' name='federated.1s4nxn20cywkdv13ql0yk0g1mpdx'
+                    version='10.0'>
+            <connection class='federated'>
+                <named-connections>
+                    <named-connection caption='mysql55.test.tsi.lan' name='mysql.1ewmkrw0mtgsev1dnurma1blii4x'>
+                        <connection class='mysql' dbname='testv1' odbc-native-protocol='yes' port='3306'
+                                    server='mysql55.test.tsi.lan' source-charset='' username='test'/>
+                    </named-connection>
+                    <named-connection caption='mssql2012.test.tsi.lan' name='sqlserver.1erdwp01uqynlb14ul78p0haai2r'>
+                        <connection authentication='sqlserver' class='sqlserver' dbname='TestV1'
+                                    odbc-native-protocol='yes' one-time-sql='' server='mssql2012.test.tsi.lan'
+                                    username='test'/>
+                    </named-connection>
+                </named-connections>
+            </connection>
+        </datasource>
+    </datasources>
+</workbook>