[xwiki-users] Adding custom object usinf groovy or velocity

Following velocity allows to create simpe xwiki document: #set ($mydoc = $xwiki.getDocument("Sandbox.Test1")) $mydoc.setContent("sdfsdf") $mydoc.save() But How can I create custom object? http://hans.gerwitz.com/projects/snipsnap-to-xwiki shows some ideas but I can't make it working for me. Another (awkward) way would be executing external curl command. How can I do this? Thanks, Valdis