[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] Re: How could RDDL be distributed ?
On Tue, Jan 16, 2001 at 04:39:35PM +0000, Miles Sabin wrote: > Michael Mealling wrote, > > Since I'm helping write some of the RESCAP documents I might be > > able to tweak them to do what you need. What do you > > actually mean by distrubtion/replication? Is it the process > > of populating the databases behind a particular RESCAP server? > > Is it more along the lines of the "I have a local version of > > that XML Schema that I like better" problem? > > The problem I want a solution to is, > > I have a public ID/system ID/URI for this DTD, external entity, > schema, RDDL doc, etc.; find me a server which can give me an > authoritative copy (in the case of a URI maybe a mirror of the > main server). > > or maybe rather than finding a server I just want the > authoritative copy itself. > > So I guess it's more the former than the latter that I'm > interested in, and yes, from my reading of the existing RESCAP > docs it doesn't appear to address that problem. Not in its entirety, no. The URI Resolution process is designed to do just that. RESCAP is used in the final process to actually ask the question your after. Here's the rought synopsis: Given any URI you take the schem and append 'uri.arpa' to the end. For HTTP you would end up with 'http.uri.arpa'. You lookup a NAPTR record in DNS. This particular record allows you to do dynamic delegation by using regular expressions (see RFC 2915 for the entire process). The output will then be a host, port, protocol, and a set of services that are available at this network point. This network end point will be authoritative for questions about that URI. You then use one of the specified protocols to ask the question. The questions can be as simple as "where is a copy of this" to "where is a copy that has been authoritatively translated into Greek and in the Unicode character set" to "Is this URI an XML namespace name?" RESCAP is my recommendation for the protocol to use to ask that final question. But it doesn't need to be the only one. I'm recommending RESCAP because it's lightweight (one UDP out and one UDP back in most cases) and fast. There is also a TLS spec so you can do any TLS layer encryption/authentication. -MM -- -------------------------------------------------------------------------------- Michael Mealling | Vote Libertarian! | www.rwhois.net/michael Sr. Research Engineer | www.ga.lp.org/gwinnett | ICQ#: 14198821 Network Solutions | www.lp.org | michaelm@n...
|
PURCHASE STYLUS STUDIO ONLINE TODAY!Purchasing Stylus Studio from our online shop is Easy, Secure and Value Priced! Download The World's Best XML IDE!Accelerate XML development with our award-winning XML IDE - Download a free trial today! Subscribe in XML format
|