On 02/03/2011 03:45 PM, xwikiadmin(a)lazypapertiger.org wrote: Do you want to overwrite the 'name' key or add a new key 'myname'? What do you mean by "fail"? If I try: {{velocity}} #set($map = {'name':'marius'}) $map.put('name','adam') $map.name and $map.myname {{/velocity}} I get: marius adam and $map.myname which is normal because $map.myname is null (was not set). If I try: {{velocity}} #set($map = {'name':'marius'}) $map.put('myname','adam') $map.name and $map.myname {{/velocity}} I get: $map.put('myname','adam') marius and adam which is normal because the put method returns the previous value mapped to the specified key, which is null in our case. It's better to write: #set($discard = $map.put('myname','adam')) Hope this helps, Marius