# 3 objective minor modification stamp.
-1 to dropping this.
Pretty much every data object I can think of keeps a last modified stamp, from HTTP resources, local files, database rows, vCards and vCalendars. I think that it is a mistake to remove this. Last modified dates are necessary for things like synchronization. I think we only need keep the last modification date though, not the whole history.
This field should be required if the post has been modified in any way.
For search engines, I agree. A search engine will read the feed and decide whether something should be revisited. The last-modified date is required for the most up-to-date index.
wunder -- Walter Underwood Principal Architect, Verity