Latest World News on Internet Business Money Market: SOA Advisor: The Content Assembly Mechanism and SOA data service layers

SOA Advisor
November 08, 2007
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The Content Assembly Mechanism and SOA data service layers
[by David RR Webber]

After almost four years of development that traces back to earlier
UN/CEFACT efforts on message transactions and core component
representation, processing, and handling (BRIM WG), version 1.1 of
the Content Assembly Model (CAM) was approved as an OASIS member
standard on June 1st, 2007.

The current CAM release provides templates that allow for the
definition of validation data services, specifically for XML-based
transactions. While existing techniques using W3C XSD schema,
namespaces, XSLT and other tools (such as Schematron and XMLBeans)
have been in existence for some time, they provide more
developer-centric and potentially brittle design options. The
intention behind the CAM initiative is to supply a more agile, fault
tolerant and adaptive method in order to help establish more robust
service interfaces. Particularly, CAM templates provide WYSIWYG-style
XML structure mapping and context driven rule selections of
components (and services) and their content.

Why is this so important to SOA data services? When applying a
service-oriented design approach Web services tend to offer
information content that matches a pre-defined (standardized) schema
structure. Although this may be initially deemed sufficient, in
practice the schema may only be fulfilling a broad and vague outline
that is light on actual implementation specifics.

Additionally, the XML Schema language is very programmer-centric.
While developers may be comfortable with schema code, it is not
necessarily helpful for agile information interfaces that need to
respond to business context criteria. For example, XML Schema
definitions cannot be effectively shared with business analysts and
general staff members.

Within typical SOA implementations, consistent and reliable service
behavior is preferred and often required by consumer programs. As a
result, the perception of service quality and the level of effort
needed to support and use services can be directly affected by
service interface content. CAM is a technology designed to improve
these aspects by allowing data service interfaces to be influenced
and even shaped by business and data analysts. For example, Figure 1
illustrates how CAM templates can be shared across a business
community of practice.

Read more about SOA data service layers here.

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