15. The article of claim 14 , wherein the plural parts of the modular document relate to respective different content of the modular document, where the different content are combinable for presentation of the modular document.
14. An article comprising at least one non-transitory computer-readable storage medium containing instructions that upon execution cause an electronic device to: receive a first instance of a modular document composed of plural parts, wherein the first instance of the modular document contains a merge definition; receive a second instance of the modular document that also contains a merge definition, wherein each of the merge definitions provides information regarding how conflicts in the first and second instances are to be resolved; resolve a conflict between the merge definitions in the first and second instances using another merge definition to produce an output merge definition; and merge the first and second instances of the modular document, wherein any conflict between the first and second instances is resolved according to the output merge definition.