2. The method as claimed in claim 1 , wherein the determination of the source document to be deleted includes the document fragment referenced by the fragment object determines whether the source document to be deleted contains data indicating that the source document is referenced by the fragment object.
2. The method as claimed in claim 1 , wherein the determination of the source document to be deleted includes the document fragment referenced by the fragment object determines whether the source document to be deleted contains data indicating that the source document is referenced by the fragment object. 3. The method as claimed in claim 2 , further comprising: (d) removing data indicating that the source document is referenced by the fragment object.