[OpenLayers-Users] Drawing/modifying features in existing vector Layer

[Mustafa646]

Hello all,

I am developing web map application using Openlayers & Geoserver. I have
displayed a vector layer (consists of more than 100 polygon features) over
google map. Below is my question:
 
Is it possible to modify any existing feature or draw a new feature in this
vector layer which i have displayed over google map ?

if yes, then how the changes will be saved back to GeoServer ? I have seen
an example (WFS-t)
http://openlayers.org/dev/examples/wfs-protocol-transactions.html

In this example, vector layer does not contain any features in it already. 
we can only add or modify a new feature and then save it. But in my case i
need to add or modify an existing feature within the vector layer which i
have displayed over google map.

Need immediate help or useful suggestion, some code example will be
appreciated.

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