rfc1491.txt

著名的RFC文档,其中有一些文档是已经翻译成中文的的.

Integrated Directory Services Working Group                     [Page 6]

RFC 1491                 X.500 Advanced Usages                 July 1993


     The current object types are very basic and may only convey the
     minimal amount of information necessary. We are now in the process
     of extending this further to a full product class hierarchy which
     is being based on information that may be sent within an EDI trade
     document using the EDI standard document syntax EDIFACT.

     By using the Directory as a repository for product information to
     aid in EDI the catalogues become available worldwide. They may be
     replicated at various nodes, and the updating and propagation of
     changes to slave copies becomes trivial.

2.2.4 Network Topology Information

   There are two projects in this area; Merit Network's Shared Whois
   Information Project, and EARN's Network Directory.

2.2.4.1 Shared Whois Information Project

   Application Name: Shared Whois Project

   Date Received: 6/1/1993

   Date Last Validated: 6/1/1993

   Author(s): Sheri Repucci

   Company or Institution: Merit Network, Inc.

   e-mail address for more information: [e-mail]

   Availability: June 1993

   Type:
     experimental prototype, not public

   List of platforms product runs on: UNIX

   Short Description:
     The Shared Whois Project merges network data held by various
     organizations.  The principal purpose of merging this data is to
     find and resolve conflicting network information between the
     databases.  The longterm goal of this project is to move away from
     the current model of storing similar and/or duplicate network
     information in multiple databases and to move to a X.500
     distributed database model.  To this end, we are working on loading
     the NSFNET network information into X.500 in anticipation of
     participating in a distributed database trial.




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RFC 1491                 X.500 Advanced Usages                 July 1993


   Full Description:
     The Shared Whois Project is a collection of programs and shell
     scripts which collectively merges the network data held by each of
     the participating organizations.  Currently this includes Merit,
     the RIPE-NCC and the InterNIC.  The principal purpose of merging
     this vast quantity of data is to find and resolve conflicting
     network information between the various databases.  It is our
     intent to merge this data bi-weekly and thus rapidly reach, and
     thereafter maintain, a stable set of commonly held network
     information.

     While there is a common set of information all three of the
     participants hold in their various databases, additional
     information unique to the function of each organization is also
     held.  Furthermore, the resulting set of data created by the merger
     holds only one entry per network without attempting to combine the
     variations.  Thus, each entry includes a listing of all databases
     found to contain information for that network as well as all
     databases found to be in conflict with the entry held in the
     resultant set.

     The longterm goal of this project is to move away from the current
     model of storing similar and/or duplicate network information in
     multiple databases and to move to a X.500 distributed database
     model.  To this end, Merit is working to load the NSFNET network
     information into X.500 in anticipation of participating in a trial
     with the InterNIC and others on the road to a globally distributed
     database model.

2.2.4.2 EARN's Network Directory

   Application Name: Ditnet/EARN Network Directory

   Date Received: 7/7/1992

   Date Last Verified: 7/7/1992

   Author(s):
     Peter Sylvester

   Company or Institution:
     Inria Rocquencourt - France

   e-mail address for more information:
     [e-mail]

   Type: FREE (data owned by EARN/Bitnet)




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RFC 1491                 X.500 Advanced Usages                 July 1993


   Short Description:
     The EARN/Bitnet Network database consists of descriptions of all
     participating members, network nodes, adminstrators, and topology
     information. This database commonly known as BITEARN NODES is being
     made available through x.500.

   Full Description:
     A full description of the contents of the EARN/Bitnet database
     can be found in some EARN internal document which is available
     as a file BITEARN NODES from any NETSERV in EARN/Bitnet. The
     contents of this file is mapped into an X.500 subtree containing
     descriptions of network nodes, adminstrational personnel, and
     topology information.

     The first version of the directory subtree will be created using a
     simple textual mapping to a flat directory tree using private
     attributes.

2.2.5 Soft Pages

   Application Name: Soft Pages

   Date Received: 9/25/1992

   Date Last Validated: 9/25/1992

   Author(s):
     Thomas Johannsen
     Glenn Mansfield

   Company or Institution:
     AIC Systems Laboratory,
     Tohoku University Sendai

   e-mail address for more information:
     [e-mail]

   Type:
     Intended for public distribution, not yet public

   FTP address: <none>

   Short Description:
     A file name look-up services for anonymous FTP servers, provides ls
     -lR information and FTP server address. Additionally, the nearest
     FTP site (from user's site) which holds the requested file is
     chosen.




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RFC 1491                 X.500 Advanced Usages                 July 1993


   Full Description:
     With the growing of number and size of electronic archives for
     documents, programs and the like, the problem of finding and
     retrieving a specific file becomes more and more complex.
     Furthermore, bandwidth in the Internet is still limited. Users
     should be encouraged and supported to do local FTP sessions as often
     as possible instead of getting everything from the other end of the
     world (i.e., the net).

     The Soft Pages Project combines an Archie-like file look-up service
     with network configuration knowledge.  A dedicated User Agent gives
     a suggestion how to retrieve a document in a network traffic
     optimized manner.

     Basically, Directory information introduced by Soft Pages falls
     into two parts: A file information part and a network configuration
     part.

     The file information part describes objects and attributes for file
     servers and their contents. For each file server, names and
     attributes of its files are stored and updated periodically. This
     provides global access to Archie-like information for all
     registered file servers and, furthermore, opens the way to store
     document description together with the file name.  Thus, document
     search is not restricted to file name matches but might be run for
     keywords as well.

     The network configuration part provides information on networks
     (subnetworks), nodes and lines in the Internet. Furthermore, IP
     numbers can be mapped to network and node objects. In order to
     evaluate file server sites, Internet (site to site) connections are
     given a cost index and then alternatives are compared by their cost
     index. Cost index is a calculated parameter representing properties
     of a connection like speed, average traffic, charges etc. where
     values for the latter are hold as attributes to line objects.

     If a document is stored at two or more sites, the site with the
     lowest cost index (which naturally will be the "nearest" in network
     terms) will be chosen for retrieval.  A Soft Pages User Agent
     basically interacts with the Directory for finding a pointer to the
     "best" copy of a file wanted by a user.

2.2.6 X-Tel

   Application Name: X-Tel's advanced applications

   Date received: 7/1/1992




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RFC 1491                 X.500 Advanced Usages                 July 1993


   Date last verified: 7/1/1992

   Author(s):
     Colin Robbins
     Julian Onions
     Graeme Lunt

   Company or Institution: X-Tel Services Ltd.

   e-mail address for more information:
     [e-mail]

   Type:
     Commercial Products / Ideas

   Short Description:
     1) Product Information.  Products that have DUA facilites built in
     have a "latest info" button or other request method.  When
     "pressed" a well known node below the X-Tel part of the tree is
     read.  The attributes contain descriptions of the latest version of
     the software, new features etc.  If you decide you would like the
     new version, a second read obtains the information required for a
     template order form.

     2) BUG Status.  As above, but obtains details of known bugs in the
     version of software you are running.  (If only we could find a way
     of putting fixes in, and automatically updating the software
     itself!)

     3) X-Terms.  We have a conferencing product, allowing X users to
     "talk" and share windows.  The problem is identifying which X
     Terminal device a particular user is currently on.  One solution we
     are using is modify a users directory entry during login to say
     which X display they have logged into.  The conference can the
     query the directory, and open windows on the appropriate device.
     The directory is also used to store details of current conferences,
     so new delegates can join the conference easily.

     4) Organisation browsing.  There are a rich set of attributes about
     people and their roles stored in the directory.  We have a special
     purpose DUA that exploits this information, and presents
     information on who manages who, who is secretary for who etc.  This
     is very useful when combined with the search ACL mechanism defined
     in OSI-DS 21 as different views can be given to different
     catergories of users.

     5) MHS use of directory.  The directory is use to store MHS routing
     information (as per the MHS DS working group documents)



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RFC 1491                 X.500 Advanced Usages                 July 1993


     6) Mail Lists.  Details of mailing lists are stored in the
     directory.  With careful use of access control, users can be given
     access so that they can subscribe and unsubscribe themselves
     to/from a list.

     7) Details of restuarants in the Nottingham area are stored in the
     directory!

     8) We plan to use the directory as a rendevuz for a multi-user
     adventure game.  Each "room" will be a different entry, and modify
     operations will be used to pick up and put down objects!

     The next two are "advanced" features of our DUA, they may not be
     considered relevant to this document!

     9) Templates.  The directory is used to store template entries.
     Our DUA then uses this template when adding new users.  Very
     useful, as a number of default attributes can be set.

     10) Editors.  Special purpose editors for a number of complex
     attribute syntaxes are built in to our DUAs.  This includes QUIPU
     ACLs, and X.400 OR Addresses.

2.2.7 Xerox Clearinghouse

   Application Name: Clearinghouse Interface

   Date Received: 7/1/1992

   Date Last Validated: 7/1/1992

   Author(s):
     Margaret Avino

   Company or Institution:
     Xerox Corporation

   e-mail address for more information
     [e-mail]

   Type:
     Early Design/Implementation stages

   Short Description:
     X.500 DSA interface to XNS (Xerox Network Services) Clearinghouse
     directory to provide access to Xerox Corporation's Clearinghouse via
     X.500 DUAs.




Integrated Directory Services Working Group                    [Page 12]