12. An article of manufacture comprising: (A) a content management system comprising: a voidable link mechanism that upon initial reconstitution of a document in a repository, retrieves from the repository objects corresponding to links in the document, stores values from the retrieved objects in corresponding fallback elements in the document, generates a list with original links and voidable links to objects referenced in the document, and replaces any original links in the document that are not voidable with a corresponding voidable link, wherein the voidable link mechanism, upon subsequent reconstitution of the document, determines the original links in the list, queries the repository to determine which of the objects corresponding to the original links in the list have not changed since the last reconstitution of the document, and for each object that has not changed since the last reconstitution of the document, the voidable link mechanism invalidates the corresponding voidable link; and (B) computer-readable media bearing the content management system.
13. The article of manufacture of claim 12 wherein the document is an XML document and the original links comprise XInclude elements in the XML document.