 value of its Content-Type header being stored as the
         document&#39;s new content type,
       * its version being updated, as well as that of its parent folder
         and further ancestor folders, using a strong validator [HTTP,
         <a href="#section-7.2">section 7.2</a>].

    The response MUST contain a strong ETag header, with the document&#39;s
    new version (for instance a hash of its contents) as its value.

    A successful DELETE request to a document MUST result in:

       * the 