RFC 3404 (rfc3404) - Page 2 of 18
Dynamic Delegation Discovery System (DDDS) Part Four: The Uniform Resource Identifiers (URI)
Alternative Format: Original Text Document
RFC 3404 DDDS Based URI Resolution October 2002 4.5 Valid Databases . . . . . . . . . . . . . . . . . . . . . . 7 5. Examples . . . . . . . . . . . . . . . . . . . . . . . . . . 8 5.1 An example using a URN . . . . . . . . . . . . . . . . . . . 8 5.2 CID URI Scheme Example . . . . . . . . . . . . . . . . . . . 9 5.3 Resolving an HTTP URI Scheme . . . . . . . . . . . . . . . . 11 6. Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 7. IANA Considerations . . . . . . . . . . . . . . . . . . . . 12 8. Security Considerations . . . . . . . . . . . . . . . . . . 12 9. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . 13 References . . . . . . . . . . . . . . . . . . . . . . . . . 13 Appendix A: Pseudo Code . . . . . . . . . . . . . . . . . . 15 Author's Address . . . . . . . . . . . . . . . . . . . . . . 17 Full Copyright Statement . . . . . . . . . . . . . . . . . . 18 1. Introduction The Dynamic Delegation Discovery System (DDDS) is used to implement lazy binding of strings to data, in order to support dynamically configured delegation systems. The DDDS functions by mapping some unique string to data stored within a DDDS Database by iteratively applying string transformation rules until a terminal condition is reached. This document describes a DDDS Application for resolving Uniform Resource Identifiers (URI). It does not define the DDDS Algorithm or a Database. The entire series of documents that do so are specified in "Dynamic Delegation Discovery System (DDDS) Part One: The Comprehensive DDDS" (RFC 3401) [1]. It is very important to note that it is impossible to read and understand any document in that series without reading the related documents. Uniform Resource Identifiers (URI) have been a significant advance in retrieving Internet-accessible resources. However, their brittle nature over time has been recognized for several years. The Uniform Resource Identifier working group proposed the development of Uniform Resource Names (URN) [8] to serve as persistent, location-independent identifiers for Internet resources in order to overcome most of the problems with URIs. RFC 1737 [6] sets forth requirements on URNs. During the lifetime of the URI-WG, a number of URN proposals were generated. The developers of several of those proposals met in a series of meetings, resulting in a compromise known as the Knoxville framework. The major principle behind the Knoxville framework is that the resolution system must be separate from the way names are assigned. This is in marked contrast to most URIs, which identify the host to contact and the protocol to use. Readers are referred to [7] for background on the Knoxville framework and for additional information on the context and purpose of this proposal. Mealling Standards Track
