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source_list =[
	{'title': 'Project', 'parent':'root'},
	{'title': 'Geometry', 'parent':'root'},
	{'title': 'Soil', 'parent':'root'},
	{'title': 'Geometries', 'parent':'Project'},
	{'title': 'Verticals', 'parent':'Project'},
	{'title': 'Points', 'parent':'Geometry'},
	{'title': 'Layers', 'parent':'Geometry'},
	{'title': 'Water', 'parent':'Geometry'},
	{'title': 'Soiltypes', 'parent':'Soil'}]


imd=dict()
for d in source_list:
	par=d['parent']
	v=d['title']
	try:
		imd[par].append(v)
	except:
		imd[par]=[v]



imd
{'Project': ['Geometries', 'Verticals'], 'Geometry': ['Points',
'Layers', 'Water'], 'root': ['Project', 'Geometry', 'Soil'], 'Soil':
['Soiltypes']}