Thanks Domenico,
I read this thread and many others during the past week but did not help.
[personal cosideration]
I think ESRI could simply publish the code from the developer summit 2012. I think, honestly, that if they did not want customers use non-esri clients, they could simply avoid to implement ogc services... exactly as they avoided to support GeoJson in the ReST API (complicating the life of the customers).
[/personal consideration]
[suggestion]
ESRI??? REAL interoperability examples needed here. Mashing-up is "the future" by years. Try to understand it... and also add real GeoJson support as input/output format for the ReST API in the next service pack for ArcGIS Server 10.1!
[/suggestion]