A method comprises: sending, to a client, data specifying a plurality of commands for use in producing a design; receiving, from the client, one of the plurality of commands, wherein the received command is for creating or modifying a new or existing element of the design, respectively; updating a data structure associated with the design in accordance with the command, wherein the update comprises adding or modifying data associated with the new or existing element, respectively; and sending, to the client, data for enabling the new or modified element to be represented via a user interface.
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