In older version of **Titan DB (ver 0.5.2)** the **TitanVertex** and **TitanEdge** implement **TitanElement** interface that has method `getProperties(String key)` that I used to retrieve the element properties values. This method was removed in new version of Titan (I am using version 1.0.0). Instead of this method I found `valueOrNull(PropertyKey key)` that does the same thing but receives **PropertyKey** as parameter and not **String** as key name. 

What is the best way to retrieve the property value/values only using property key name as String object?

Or is there simple way to get PropertyKey object from property key name as String?