10. A system comprising: a set of devices, at least one device of the system being arranged: to receive a real-world description in the form of an instruction set of a markup language, the real-world description including asset terms and effect terms, to request assets associated with the asset terms and effects associated with the effect terms according to the terms in the real-world description, and to modify at least one asset associated with an asset term in the real-world description according to at least one effect identified by associated with an effect term in the real-world description, the devices of the set being operated according to the at least one modified asset.
10. A system comprising: a set of devices, at least one device of the system being arranged: to receive a real-world description in the form of an instruction set of a markup language, the real-world description including asset terms and effect terms, to request assets associated with the asset terms and effects associated with the effect terms according to the terms in the real-world description, and to modify at least one asset associated with an asset term in the real-world description according to at least one effect identified by associated with an effect term in the real-world description, the devices of the set being operated according to the at least one modified asset. 11. A system according to claim 10 , wherein at least some of the devices of the set are interconnected by a wireless network.