XML Server Technologies

In the following section, we will see some of the popular XML Server technologies. SAIC/BELLCORE: Universal Commerce Language and Protocol (UCLLP) & the MISTI Application. UCLP is designed as an XML compliant schema for authoring metadata that will facilitate locating and extracting information located across the internet. In addition, it is intended to provide a base level of datatyping that may be extended as necessary for industry specific applications and granularity needs.

Implementing UCLP

An UCLP Compliant document has same structure as an HTML document. They are intermixed within the body of the HTML Page. This is possible when user agents comply with the requirements of processing HTML documents, which are to ignore what you don't understand. Therefore, the presence of foreign elements won't harm the HTML document.

Adobe Systems Inc., at al: The Information and Content Exchange Protocol OCE): This XML application was developed by W#C members which is intended for use by syndicates to streamline and automate content exchange and re use.

Implementing ICE

In any system that requires consistent implementations across multiple participants, constraints must be placed on either the expression of content or the structural form that content may take. The desired goals for ICE are as follows;

ICE shall support a variety of applications and not constrain data formats.

The ICE requirements shall constrain the ICE process to practical and implementable mechanisms.

At first glance, these goals may seem contradictory, but actually, they complement each other. The domain the ICE authoring group used to illustrate this point is the production and sharing of banner ads. For successful collabration between the' partners, what constitutes a banner and must be defined. Rules would be developed that dedicate the file format and physical dimensions expressed in pixels.

WDDX

Web Distributed Data Exchange (WDDX) was originated by Allaire Corporation and first appeared in their ColdFusion 4 product Web Distributed Data Exchange (WDDX) is a pragmatic approach to the problem of exchanging common data structures between various programming environments and operating systems. WDDX is a dialect of XML that is designed to easily represent data structures common to most programming environments. WDDX is focussed on solving a particular problem: application to application data exchange where the syntax of the XML encoding does not matter.The main focuses of WDDX is ease of use, and to that end there are WDDX modules for many major programming environments. The purpose of these modules are to handle conversion of native data types to a WDDX packet(process of serialisation) and conversion of a WDDX packet back to native data types(process of deserialization). Some of WDDX modules for following programming environments al ready exists,

The COM implementation is usable from any environment that supports COM such as ASP, VB, C++ and so on. All of these implementations provide single step conversion from native data types to WDDX and back, without requiring any knowledge of XML on the programmer's part.

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