Julian Reschke wrote:
Maybe I'm missing something here, but...: is it that exceptional to
have different XML schemas for the various stages a document may be
in? Why not simply define a schema that contains everything that must
be there, and which makes atom:id and atom:updated optional?
A "Transitional Atom" schema that relaxes a few of the MUST's is
definitely conceivable (whether it's a good idea is another question
altogether).
Transitional Atom Entries could be defined in a separate I-D and
references from the APP. Entry collections could optionally accept
Transitional Atom entries. Post a regular Atom entry to the collection
and it MUST be valid (with atom:id, with atom:updated, etc). Post a
Transitional Atom entry to the collection and the server has to create a
valid Atom entry from it.
media type: application/atomtransitional+xml
namespace URI: http://www.w3.org/2005/Atom-transitional
t-atomEntry =
element t-atom:entry {
atomCommonAttributes,
(atomAuthor*
& atomCategory*
& atomContent?
& atomContributor*
& atomId?
& atomLink*
& atomPublished?
& atomRights?
& atomSource?
& atomSummary?
& atomTitle
& atomUpdated?
& extensionElement*)
}
* t-atom:entry elements MAY contain one or more atom:author elements
* t-atom:entry elements MAY contain any number of atom:category
elements.
* t-atom:entry elements MUST NOT contain more than one atom:content
element.
* t-atom:entry elements MAY contain any number of atom:contributor
elements.
* t-atom:entry elements MAY contain exactly one atom:id element.
* t-atom:entry elements that contain no child atom:content element
MUST contain at least one atom:link element with a rel attribute value
of "alternate".
* t-atom:entry elements MUST NOT contain more than one atom:link
element with a rel attribute value of "alternate" that has the same
combination of type and hreflang attribute values.
* t-atom:entry elements MAY contain additional atom:link elements
beyond those described above.
* t-atom:entry elements MUST NOT contain more than one
atom:published element.
* t-atom:entry elements MUST NOT contain more than one atom:rights
element.
* t-atom:entry elements MUST NOT contain more than one atom:source
element.
* t-atom:entry elements MUST contain an atom:summary element in
either of the following cases:
* the atom:entry contains an atom:content that has a "src"
attribute (and is thus empty).
* the atom:entry contains content that is encoded in Base64;
i.e. the "type" attribute of atom:content is a MIME media type
[MIMEREG], but is not an XML media type [RFC3023], does not begin with
"text/", and does not end with "/xml" or "+xml".
* t-atom:entry elements MUST NOT contain more than one atom:summary
element.
* t-atom:entry elements MUST contain exactly one atom:title element.
* t-atom:entry elements MAY contain exactly one atom:updated element.
<entry xmlns="http://www.w3.org/2005/Atom-transitional";>
<title>A transitional entry</title>
<summary>When POST'ed to an entry collection, the server would create
a real Atom entry based on it's contents</summary>
<content type="text">
Several of the MUST's are relaxed: atom:id is optional, atom:updated
is optional, atom:author is optional, etc. In order to
create a valid Atom Entry from this, some processor would need to
fill in the missing pieces of information
</content>
</entry>
- James
