2. A method according to claim 1 , wherein the model identifies specific relationships between the elements of the model, and each of the model elements has defined properties, and wherein: at least some of the documents include first and second types of text; the first type of text is retrieved from the properties of the model elements; the second type of text is reproduced verbatim from a template; and the structure of the documents is derived from the structure of the model.
2. A method according to claim 1 , wherein the model identifies specific relationships between the elements of the model, and each of the model elements has defined properties, and wherein: at least some of the documents include first and second types of text; the first type of text is retrieved from the properties of the model elements; the second type of text is reproduced verbatim from a template; and the structure of the documents is derived from the structure of the model. 10. A method according to claim 2 , further comprising the steps of: the user selecting a portion of the document; opening a graph editor on the portion of the model represented by said selected portion of the document; the user using the graph editor to make changes to the model; and the changed model content being refreshed wherever said model content appears in all of the documents.