Input #1 - To preserve the password of datasource
 
<resource:updateDataSource xmlns:resource="http://www.compositesw.com/services/system/admin/resource" xmlns:common="http://www.compositesw.com/services/system/util/common">
<resource:path>/shared/examples/ds_orders</resource:path>
<resource:detail>FULL</resource:detail>
<resource:annotation></resource:annotation>
<resource:attributes>
<common:attribute>
<common:name>password</common:name>
<common:type>PASSWORD_STRING</common:type>
<common:value></common:value>
<common:unset>true</common:unset>
</common:attribute>
</resource:attributes>
</resource:updateDataSource>

Input# 2 - Without preserving the password of data source
 
<resource:updateDataSource xmlns:resource="http://www.compositesw.com/services/system/admin/resource" xmlns:common="http://www.compositesw.com/services/system/util/common">
<resource:path>/shared/examples/ds_orders</resource:path>
<resource:detail>SIMPLE</resource:detail>
<resource:annotation>enable passthrough without saving password</resource:annotation>
<resource:attributes>
<common:attribute>
<common:name>isPassThrough</common:name>
<common:type>STRING</common:type>
<common:value>Enabled</common:value>
</common:attribute>
</resource:attributes>
</resource:updateDataSource>