What are the meaning of "mediate" and "tag-mediated" in the sentence below?

To test this hypothesis two versions of Echo were ran for each experiment, one in which interactions were mediated by tags and conditions (hence subject to coevolution) and another in which interactions took place randomly. The tag-mediated simulation fit the data better than the purely random one.


Tag-mediation describes a process in biological environmental algorithmic simulations whereby instead of purely random interactions between and among the genotypes, interactions are conditioned upon the matching of "tags" (identifying strings of text) which have been prefixed to the data objects that represent the creatures involved in the simulation. These tags are like labels referring to particular states which must obtain or conditions which must be met in order for an interaction to occur between two labelled (or tagged) creatures.

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