  Informational structural realism in the context of the foundations of computer science is defended by Floridi (2008). Structuralism has also become popular in metaphysics recently in the form of causal essentialism. This is the doctrine that the causal relations that properties bear to other properties exhaust their natures. See Shoemaker (1980) and Hawthorne (2001). Steven Mumford (2004) adopts a structuralist theory of properties. Alexander Bird's (2007) theory of dispositions is in some ways structuralist. Anjan Chakravartty's (2007) deploys dispositional essentialism in the defence of scientific realism. Michael Esfeld (2011) discusses structuralism about powers. Finally, Verity Harte (2002) discusses an interesting Platonic form of structuralism. Alistair Isaac (forthcoming) argues for structural realism for secondary qualities.