as an end user,
I want to see network elements retrieved from network controller system
In order to be able to analyize the network and see the network elements visualized

• Network Elements are: Roadm , xponder , plugable external devices.
• Roadm devices can contain: srg , degree nodes.
• Roadm can contain both srg and degrees or degree nodes only.
• Diagram need to show the nodes grouped by devices such as Roadm that contains degree and srg.
• Xponders nodes may contain several xponders
• also diagram should show devices that doesn't contain nodes such as external pluggable devices.

• Devices are grouped by location
• the location is repsented as CLLI , which represent a building that contins several devices
• for example: paris building contains one roadm devices and two exponders and one ext devices