stumpr is right. The tag managed entity that you see as part of the vSphere SDK API is deprecated. Tags are stored in Inventory Service and can be created either using the web client or power CLI. If you are experimenting with the 6.0 Beta version, then tagging can also be accessed via API using the public SDK. But for 5.5, web client and power CLI are the only ways to get to tagging, sorry 
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Re: vSphere SDK API to get Tags of VirtualMachine (ManagedEntity) from vCenter 5.5
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