Hello Kamalessh,
What kind of metadata are you looking in the Universe?
There is still legacy COM SDKs available for the UNV universe.
There is a new Semantic Layer Java SDKs which is introduced from BI 4.0 FP3 onwards & is only capable of handling UNX universes.
I would recommend you to use the Semantic Layer Java SDKs, as you can also automate the process of UNV to UNX conversion & can design the tool in a single language platform.
I would suggest you to take a look at the Developer Guide, API Reference& Object Model Diagram of Semantic Layer SDKs.
This will give you an idea, that how SL SDKs works & what kind of information you can fetch from the Universe.
Hope this will give you a head start.
Thanks,
Shailendra