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The increasing market penetration of plug-in electric vehicles also brings along a rising number of mobility service providers. This results in various business models competing against each other for the customer's favor. As a result various smart charging approaches will be pursued. This might lead to major interoperability issues for V2G communications, if standardization bodies do not wisely address them. Hence, this work derives a generic V2G information model allowing for mutual charge schedule negotiations between EVs and grid operators. Major requirements are derived from a holistic system model and respected by the proposed design. The proposed information model allows for efficient handling of multiple tariffs for charging EVs.