5. A document generation system comprising: one or more first computers which are configured to: access a document template comprising predetermined elements of content for possible use when generating a customized document; access data associated with the document template, the data representing first and second rules for making, respectively, first and second determinations as to the use to be made of the predetermined elements of content when generating a customized document, the first and second determinations each requiring further information to be received; receive information enabling at least the first determination to be made; make the first determination on the basis of the received information; generate a partially customized document in accordance with the outcome of the first determination such that the partially customized document includes an element of conditional content selected based on evaluation of the first rule; and associate, with the generated partially customized document, data representing the second rule; and one or more second computers which are configured to: receive the partially customized document and associated data representing the second rule; receive information enabling at least the second determination to be made; and make the second determination without reference to the document template on the basis of the received information and the data representing the second rule associated with the partially customized document.
5. A document generation system comprising: one or more first computers which are configured to: access a document template comprising predetermined elements of content for possible use when generating a customized document; access data associated with the document template, the data representing first and second rules for making, respectively, first and second determinations as to the use to be made of the predetermined elements of content when generating a customized document, the first and second determinations each requiring further information to be received; receive information enabling at least the first determination to be made; make the first determination on the basis of the received information; generate a partially customized document in accordance with the outcome of the first determination such that the partially customized document includes an element of conditional content selected based on evaluation of the first rule; and associate, with the generated partially customized document, data representing the second rule; and one or more second computers which are configured to: receive the partially customized document and associated data representing the second rule; receive information enabling at least the second determination to be made; and make the second determination without reference to the document template on the basis of the received information and the data representing the second rule associated with the partially customized document. 7. The system according to claim 5 , wherein the first and second rules are represented in the document template in the form of mark-up of the predetermined elements of content.