12. A system according to claim 10 wherein said data indicating a relationship to said one or more different documents comprises data identifying the received document as well as data identifying one of said one or more different documents and data identifying the relationship between said received document and said one of said one or more different documents.
12. A system according to claim 10 wherein said data indicating a relationship to said one or more different documents comprises data identifying the received document as well as data identifying one of said one or more different documents and data identifying the relationship between said received document and said one of said one or more different documents. 13. A system according to claim 12 wherein said data identifying said received document and said data identifying said one of said one or more different documents comprises said associated document identifier.