The bids can also take more complicated format, for example, using a strategy specification language which can be interpreted or even be a real executable program. The syntax and the semantics of the strategy specification language are published. Similar to the issues previously discussed on evaluation specification language, the strategy specification language design bears the same security concerns as the evaluation algorithm specification language design discussed in the previous subsection.
The bidder may also enter a meta-strategy that expresses their strategy for some sequence of auctions. These meta-strategies may include such features as: reselling something that was purchased, and exchanging information with other meta-strategy agents.