rfc2655.txt

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   those likely to foster correct referrals.

5.  Internationalization

   The internationalization of SOIF depends on the registration of
   template-types.  Since TEMPLATE-TYPEs and ATTRIBUTE IDENTIFIERs must
   be in ASCII characters, only languages which use the ASCII character
   set are fully supported for unregistered TEMPLATE-TYPEs.  For
   registered template types, in contrast, the specification of an
   ATTRIBUTE's definition will allow UI designers to present a native-
   language mapping of the ATTRIBUTE to the end user.  Further, the
   inclusion of data type and encoding information in the description of
   VALUEs means that any language encoding or character set required by
   a particular application may be supported.  For unregistered template
   types, the ability of peer servers to pass schema definitions may



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   provide a form of "private registration" which could provide some of
   the facilities for internationalization available to registered
   template types.  (See above, section 3.1 and Refs. 6 and 7.)

6.  Example Summary Objects

   The appendices contain example summary objects encoded using specific
   template types.  The following are some example summary objects using
   the generic "DOCUMENT" SOIF template-type:

   @DOCUMENT { http://home.netscape.com:80/
   Title{19}:  Welcome to Netscape
   Content-Type{9}:    text/html
   Content-Length{5}:  33262
   }

   @DOCUMENT { http://home.netscape.com/eng/ssl3/ssl-toc.html
   Title{19}:  SSL Protocol V. 3.0
   Content-Type{9}:    text/html
   Content-Length{5}:  5870
   Author-1{14}:   Alan O. Freier
   Author-2{14}:   Philip Karlton
   Author-3{14}:   Paul C. Kocher
   Abstract{318}:  This document specifies Version 3.0 of the
   <B>Secure Sockets Layer (SSL V3.0)</B> protocol, a security
   protocol that provides communications privacy over the Internet.
   The protocol allows client/server applications to communicate in
   a way that is designed to prevent eavesdropping, tampering, or
   message forgery.
   }

   @DOCUMENT { http://www.nissanmotors.com/1996/300ZX/pictures/300zx.jpg
   Content-Type{10}:    image/jpeg
   Content-Length{5}:  25940
   Last-Modified{31}:  Tuesday, 11-Jun-96 19:18:44 GMT
   Thumbnail{259}:     ..................
   }

7.  Security

   Please see (Ref. 1) for a general discussion of Security concerns for
   the CIP framework.

   SOIF currently contains no requirement that any template type contain
   an authentication ATTRIBUTE.  SOIF summary objects lacking
   authentication ATTRIBUTEs must, therefore, be treated as unreliable
   indicators of the referenced resource's content.  A hostile party
   could create a summary object which significantly misrepresented a



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   resource's content.  As part of a CIP mesh, this data could either
   channel a large number of requestors to a resource (possibly
   resulting in a denial of service) or away from a resource (possibly
   resulting in a loss of appropriate visibility).

8.  References

   [1]  Allen, J. and M. Mealling, "The Architecture of the Common
        Indexing Protocol (CIP)", RFC 2651, August 1999.

   [2]  The Harvest Information Discovery and Access System:
        <URL:http://harvest.transarc.com/>.

   [3]  D. Beckett, IAFA Templates in Use as Internet Metadata, 4th
        Int'l WWW Conference, December 1995,
        <URL:http://www.hensa.ac.uk/tools/www/iafatools/>

   [4]  L. Lamport, LaTeX: A Document Preparation System, Addison-
        Wesley, Reading, Mass., 1986.

   [5]  Berners-Lee, T., Masinter, L. and M. McCahill, "Uniform Resource
        Locators (URL)", RFC 1738, December 1994.

   [6]  D. Hardey, Resource Description Messages (RDM), W3C Note-rdm-
        960724, July 24, 1996, <URL:http://www.w3.org/pub/WWW/TR/NOTE-
        rdm.html>

   [7]  L. Gravano, K. Chang, H. Garcia-Molina, C. Lagoze, A. Paepcke,
        STARTS: Stanford Protocol Proposal for Internet Retrieval and
        Search, January 1997, <URL:http://www-
        db.stanford.edu/~gravano/starts.html>

   [8]  S. Weibel, J. Kunze, C. Lagoze, Dublin Core Metadata for Simple
        Resource Description, Work in Progress.

   [9]  E. Miller, Dublin Core Element Set Crosswalk, January 1997,
        <URL:http://www.oclc.org:5046/~emiller/DC/crosswalk.html>

   [10] Hardie, T., "Registration Procedures for SOIF Template Types",
        RFC 2656, August 1999.











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9.  Authors' Addresses

   Ted Hardie
   Equinix
   901 Marshall Street
   Redwood City, CA 94063 USA

   EMail: [e-mail]


   Mic Bowman
   Transarc Corporation
   The Gulf Tower
   707 Grant Street
   Pittsburgh, PA 15219 USA

   Phone: [phone]
   EMail: [e-mail]


   Darren Hardy
   Netscape Communications Corp.
   685 E. Middlefield Road
   Mountain View, CA 94043 USA

   Phone: [phone]
   EMail: [e-mail]


   Mike Schwartz
   Affinia, Inc.
   621 17th Street, Suite 1700
   Denver, CO 80293

   Phone: [phone]
   E-mail: [e-mail]


   Duane Wessels
   National Laboratory for Applied Network Research

   Phone: [phone]
   EMail: [e-mail]








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Appendix A.

   Common Attributes for "FILE" Template-type Summary Objects created by
   Harvest:

   Abstract
      Brief abstract about the object.

   Author
      Author(s) of the object.

   Description
      Brief description about the object.

   File-Size
      Number of bytes in the object.

   Full-Text
      Entire contents of the object.

   Gatherer-Host
      Host on which the Gatherer ran to extract information from the
      object.

   Gatherer-Name
      Name of the Gatherer that extracted information from the object.
      (eg. Full-Text, Selected-Text, or Terse).

   Gatherer-Port
      Port number on the Gatherer-Host that serves the Gatherer's
      information.

   Gatherer-Version
      Version number of the Gatherer.

   Update-Time
      The time that Gatherer updated the content summary for the object.

   Keywords
      Searchable keywords extracted from the object.

   Last-Modification-Time
      The time that the object was last modified.

   MD5
      MD5 16-byte checksum of the object.





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   Refresh-Rate
      The number of seconds after Update-Time when the summary object is
      to be re-generated.  Defaults to 1 month.

   Time-to-Live
      The number of seconds after Update-Time when the summary object is
      no longer valid.  Defaults to 6 months.

   Title
      Title of the object.

   Type The object's type. Some example types are:

         Archive
         Audio
         Awk
         Backup
         Binary
         C
         CHeader
         Command
         Compressed
         CompressedTar
         Configuration
         Data
         Directory
         DotFile
         Dvi
         FAQ
         FYI
         Font
         FormattedText
         GDBM
         GNUCompressed
         GNUCompressedTar
         HTML
         Image
         Internet-Draft
         MacCompressed
         Mail
         Makefile
         ManPage
         Object
         OtherCode
         PCCompressed
         Patch
         Perl
         PostScript



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         RCS
         README
         RFC
         SCCS
         ShellArchive
         Tar
         Tcl
         Tex
         Text
         Troff
         Uuencoded
         WaisSource

   Update-Time
      The time that the summary object was last updated.  REQUIRED
      field, no default.