Network Working Group J. F. Reschke Internet Draft greenbytes Expires: September 2002 S. Eissing greenbytes March 2002 Including additional properties in WebDAV PROPFIND/allprop requests draft-reschke-webdav-allprop-include-01 Status of this Memo This document is an Internet-Draft and is in full conformance with all provisions of Section 10 of RFC2026. Internet-Drafts are working documents of the Internet Engineering Task Force (IETF), its areas, and its working groups. Note that other groups may also distribute working documents as Internet-Drafts. Internet-Drafts are draft documents valid for a maximum of six months and may be updated, replaced, or obsoleted by other documents at any time. It is inappropriate to use Internet-Drafts as reference material or to cite them other than as "work in progress". The list of current Internet-Drafts can be accessed at http://www.ietf.org/ietf/1id-abstracts.txt. The list of Internet-Draft Shadow Directories can be accessed at http://www.ietf.org/shadow.html. This Internet-Draft will expire in September 2002. Copyright Notice Copyright (C) The Internet Society (2002). All Rights Reserved. Abstract Recent specifications extending the Web Distributed Authoring Protocol (WebDAV) restrict the set of properties returned automatically upon a PROPFIND/allprop request. This specification defines a method to add specific properties to the set of properties returned upon PROPFIND/allprop. Reschke & Eissing Expires September 2002 [Page 1]
. Internet Draft WebDAV PROPFIND/allprop/include March 2002 Distribution of this document is unlimited. Please send comments to the Distributed Authoring and Versioning (WebDAV) working group at w3c-dist-auth@w3.org, which may be joined by sending a message with subject "subscribe" to w3c-dist-auth-request@w3.org. Discussions of the WEBDAV working group are archived at URL: http://lists.w3.org/Archives/Public/w3c-dist-auth/. Reschke & Eissing Expires September 2002 [Page 2]
. Internet Draft WebDAV PROPFIND/allprop/include March 2002 Table of Contents Abstract . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Table of Contents . . . . . . . . . . . . . . . . . . . . . . . . 3 1 Notational Conventions . . . . . . . . . . . . . . . . . . . . 4 2 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 5 3 Extensions to PROPFIND/allprop . . . . . . . . . . . . . . . . 6 3.1 Example for PROPFIND/allprop/include with extended server . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 3.2 Example for PROPFIND/allprop/include with non-extended server . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 4 Changes to WebDAV DTD . . . . . . . . . . . . . . . . . . . . . 10 5 Compatibility Considerations . . . . . . . . . . . . . . . . . 11 6 Internationalization Considerations . . . . . . . . . . . . . . 12 7 IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 13 8 Copyright . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 9 Intellectual Property . . . . . . . . . . . . . . . . . . . . . 15 Normative References . . . . . . . . . . . . . . . . . . . . . . 16 Informative References . . . . . . . . . . . . . . . . . . . . . 16 Author's Addresses . . . . . . . . . . . . . . . . . . . . . . . 16 A Change Log . . . . . . . . . . . . . . . . . . . . . . . . . . 17 A.1 Since 'draft-reschke-webdav-allprop-include-00' . . . . . . 17 Reschke & Eissing Expires September 2002 [Page 18]
. Internet Draft WebDAV PROPFIND/allprop/include March 2002 1 Notational Conventions The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in [RFC2119]. Reschke & Eissing Expires September 2002 [Page 4]
. Internet Draft WebDAV PROPFIND/allprop/include March 2002 2 Introduction Recent specifications extending the "Web Distributed Authoring Protocol" (WebDAV, [RFC2518]) like "Versioning Extensions to WebDAV" [RFC3253] and "WebDAV Access Control Protocol" [ACL] restrict the set of properties returned automatically upon a PROPFIND/allprop request in order to avoid the expensive computation of properties that the client in many cases isn't interested in. However, this change from the behaviour defined in WebDAV can lead to situations where clients need to perform two requests to retrieve all properties they are interested in (one using PROPFIND/allprop, then PROPFIND/prop enumerating the new properties that weren't reported upon the first request). This specification defines a backward- compatible extension to add specific properties to the set of properties returned upon PROPFIND/allprop, thus saving at least one PROPFIND request. This document defines an extension element that could ultimately become part of the core WebDAV protocol. Being just an individual submission, it currently defines it in the proprietary namespace http://sapportals.com/xmlns/cm/webdav instead of the "DAV:" namespace. It uses a prefix of "in:" for referring to elements in this namespace. However, WebDAV server and clients are free to use any prefix, provided that there is a namespace declaration that binds the prefix to the URI of the same namespace. Reschke & Eissing Expires September 2002 [Page 5]
. Internet Draft WebDAV PROPFIND/allprop/include March 2002 3 Extensions to PROPFIND/allprop The "allprop" version of PROPFIND is extended to take an optional <in:include> element. When present, it contains a set of property names that shall be reported in addition to those properties that the server usually would return upon PROPFIND/allprop. 3.1 Example for PROPFIND/allprop/include with extended server >>Request PROPFIND /container/front.html HTTP/1.1 Host: www.foo.bar Depth: 1 Content-Type: text/xml; charset="utf-8" Content-Length: xxxx <?xml version="1.0" encoding="utf-8" ?> <propfind xmlns="DAV:" xmlns:in="http://sapportals.com/xmlns/cm/webdav"> <allprop/> <in:include> <checked-in/> <checked-out/> </in:include> </propfind> >>Response HTTP/1.1 207 Multi-Status Content-Type: text/xml; charset="utf-8" Content-Length: xxxx <?xml version="1.0" encoding="utf-8" ?> <multistatus xmlns="DAV:"> <response> <href>http://www.foo.bar/container/front.html<href> <propstat> <prop> <R:bigbox xmlns:R="http://www.foo.bar/boxschema/"> <R:BoxType>Box type B</R:BoxType> </R:bigbox> <creationdate>1997-12-01T18:27:21-08:00</creationdate> Reschke & Eissing Expires September 2002 [Page 6]
. Internet Draft WebDAV PROPFIND/allprop/include March 2002 <displayname>Example HTML resource</displayname> <getcontentlength>4525</getcontentlength> <getcontenttype>text/html</getcontenttype> <getetag>zzyzx</getetag> <getlastmodified >Monday, 12-Jan-98 09:25:56 GMT</getlastmodified> <resourcetype/> <supportedlock> <lockentry> <lockscope><exclusive/></lockscope> <locktype><write/></locktype> </lockentry> <lockentry> <lockscope><shared/></lockscope> <locktype><write/></locktype> </lockentry> </supportedlock> <checked-in> <href >http://www.foo.bar/versions/container/front.html-1</href> </checked-in> </prop> <status>HTTP/1.1 200 OK</status> </propstat> <propstat> <prop> <checked-out/> </prop> <status>HTTP/1.1 404 NOT FOUND</status> </propstat> </response> </multistatus> In this example, the server has recognized the extension element <in:include> and included the DAV: properties <checked-in> and <checked-out> (as defined in [RFC3253]). 3.2 Example for PROPFIND/allprop/include with non-extended server >>Request PROPFIND /container/front.html HTTP/1.1 Host: www.foo.bar Depth: 1 Reschke & Eissing Expires September 2002 [Page 7]
. Internet Draft WebDAV PROPFIND/allprop/include March 2002 Content-Type: text/xml; charset="utf-8" Content-Length: xxxx <?xml version="1.0" encoding="utf-8" ?> <propfind xmlns="DAV:" xmlns:in="http://sapportals.com/xmlns/cm/webdav"> <allprop/> <in:include> <checked-in/> <checked-out/> </in:include> </propfind> >>Response HTTP/1.1 207 Multi-Status Content-Type: text/xml; charset="utf-8" Content-Length: xxxx <?xml version="1.0" encoding="utf-8" ?> <multistatus xmlns="DAV:"> <response> <href>http://www.foo.bar/container/front.html<href> <propstat> <prop> <R:bigbox xmlns:R="http://www.foo.bar/boxschema/"> <R:BoxType>Box type B</R:BoxType> </R:bigbox> <creationdate>1997-12-01T18:27:21-08:00</creationdate> <displayname>Example HTML resource</displayname> <getcontentlength>4525</getcontentlength> <getcontenttype>text/html</getcontenttype> <getetag>zzyzx</getetag> <getlastmodified >Monday, 12-Jan-98 09:25:56 GMT</getlastmodified> <resourcetype/> <supportedlock> <lockentry> <lockscope><exclusive/></lockscope> <locktype><write/></locktype> </lockentry> <lockentry> <lockscope><shared/></lockscope> <locktype><write/></locktype> </lockentry> Reschke & Eissing Expires September 2002 [Page 8]
. Internet Draft WebDAV PROPFIND/allprop/include March 2002 </supportedlock> </prop> <status>HTTP/1.1 200 OK</status> </propstat> </response> </multistatus> In this case the <in:include> element was simply ignored. The client can detect this situation by checking for the presence of the requested properties and will have to issue an additional PROPFIND/prop request (to retrieve the missing properties). Reschke & Eissing Expires September 2002 [Page 9]
. Internet Draft WebDAV PROPFIND/allprop/include March 2002 4 Changes to WebDAV DTD <!ELEMENT propfind ((allprop, in:include+) | propname | prop) > <!ELEMENT in:include ANY > Note that the WebDAV DTD is informal only and cannot be used to validate request or response bodies (due to the inability to properly work with XML namespaces). Reschke & Eissing Expires September 2002 [Page 10]
. Internet Draft WebDAV PROPFIND/allprop/include March 2002 5 Compatibility Considerations This specification introduces a new child element for the <propfind> element, defined in Section 4. Old servers will ignore this element (see [RFC2518], chapter 14). Clients can detect this situation as outlined in Section 3.2. Clients not aware of this specification will not be affected at all, because they will never use the new <in:include> element in PROPFIND requests. Reschke & Eissing Expires September 2002 [Page 11]
. Internet Draft WebDAV PROPFIND/allprop/include March 2002 6 Internationalization Considerations This proposal builds on [RFC2518], and inherits its internationalizability. Reschke & Eissing Expires September 2002 [Page 12]
. Internet Draft WebDAV PROPFIND/allprop/include March 2002 7 IANA Considerations This proposal does not introduce any new IANA considerations, since it does not specify any new namespaces (in the general sense), but merely uses existing ones. Reschke & Eissing Expires September 2002 [Page 13]
. Internet Draft WebDAV PROPFIND/allprop/include March 2002 8 Copyright To be supplied by the RFC Editor. Reschke & Eissing Expires September 2002 [Page 14]
. Internet Draft WebDAV PROPFIND/allprop/include March 2002 9 Intellectual Property To be supplied by the RFC Editor. Reschke & Eissing Expires September 2002 [Page 15]
. Internet Draft WebDAV PROPFIND/allprop/include March 2002 Normative References [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, March 1997. [RFC2518] Goland, Y., Whitehead, E., Faizi, A., Carter, S.R. and Jensen, D., "HTTP Extensions for Distributed Authoring -- WEBDAV", RFC 2518, February 1999. [RFC3253] Clemm, G., Amsden, J., Ellison, T., Kaler, C. and Whitehead, J., "Versioning Extensions to WebDAV", RFC 3253, March 2002. Informative References [ACL] Clemm, G., Hopkins, A., Sedlar, E. and Whitehead, J., "WebDAV Access Control Protocol", ID draft-ietf-webdav- acl-07, November 2001. Author's Addresses Julian F. Reschke greenbytes GmbH Salzmannstrasse 152 Muenster, NW 48159 Germany Phone: +49 251 2807760 Fax: +49 251 2807761 EMail: julian.reschke@greenbytes.de URI: http://www.greenbytes.de/tech/webdav/ Stefan Eissing greenbytes GmbH Salzmannstrasse 152 Muenster, NW 48159 Germany Phone: +49 251 2807760 Fax: +49 251 2807761 EMail: stefan.eissing@greenbytes.de URI: http://www.greenbytes.de/tech/webdav/ Reschke & Eissing Expires September 2002 [Page 16]
. Internet Draft WebDAV PROPFIND/allprop/include March 2002 A Change Log A.1 Since 'draft-reschke-webdav-allprop-include-00' Moved <include> element out of "DAV:" namespace. Updated reference to deltaV (now RFC3253). Changed examples to explicitly use utf-8 encoding for HTTP content type and XML encoding. Updated WebDAV ACL reference to draft 07. Made sure figures fit in 72 columns. Split references into "Normative" and "Informative". Full Copyright Statement Copyright (C) The Internet Society (2002). All Rights Reserved. This document and translations of it may be copied and furnished to others, and derivative works that comment on or otherwise explain it or assist in its implementation may be prepared, copied, published and distributed, in whole or in part, without restriction of any kind, provided that the above copyright notice and this paragraph are included on all such copies and derivative works. However, this document itself may not be modified in any way, such as by removing the copyright notice or references to the Internet Society or other Internet organizations, except as needed for the purpose of developing Internet standards in which case the procedures for copyrights defined in the Internet Standards process must be followed, or as required to translate it into languages other than English. The limited permissions granted above are perpetual and will not be revoked by the Internet Society or its successors or assigns. This document and the information contained herein is provided on an "AS IS" basis and THE INTERNET SOCIETY AND THE INTERNET ENGINEERING TASK FORCE DISCLAIMS ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTY THAT THE USE OF THE INFORMATION HEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. Acknowledgement Funding for the RFC editor function is currently provided by the Internet Society. Reschke & Eissing Expires September 2002 [Page 17]
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