Right now the only way to add sample data is to modify the existing adhoc documents and run this code:
xdmp:document-insert('/sample.xml',
<sample:sampleDoc xmlns:sample="http://sample.com">
<sample:database>SAMPLE</sample:database>
<sample:uri>/sample/sample-uri</sample:uri>
<sample:type>add</sample:type>
<sample:date>2014-04-10T23:52:39.335561-04:00</sample:date>
<sample:collection>SAMPLE-COLLECTION</sample:collection>
<sample:oldElement/>
</sample:sampleDoc>)
Right now the only way to add sample data is to modify the existing adhoc documents and run this code: