[Gegl-Developer] How to connect to signal emitted by gobject properties.

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hi, 
I want to hook "notify" signal emitted by GeglOperation properties. But for that I need operation's 'properties' gobject. I can easily hook for 'GeglOperation' since its a 'gobject' instance but how can I hook for a property? I tried hook by GValue by 'g_object_get'. also tried to hook by 'g_object_class_find_property()' which returns a 'GParamSpecInt' type of value. as expected it didn't work as they aren't gobjects. 
In short how can I get properties 'gobject' instance? I checked gonme developer site, gobject's documentation still no luck.
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