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<H4><A name="SDOOverview-WhatisServiceDataObject%3F"></A>What is Service Data Object?</H4>
<P>SOA creates an environment where different types of data must work together. This makes application development complex. Service Data Object(SDO), provides a very simple programming model that addresses this issue. The key high level advantages of SDO are:</P>
<UL>
<LI>Uniform access to data from heterogeneous sources which could be XML, RDB, POJO, SOAP, etc.</LI>
<LI>SDO provides both a static (or strongly typed) programming model and a dynamic (or loosely typed) programming model. This provides a simple programming model without sacrificing the dynamic model needed by tools and frameworks.</LI>
<LI>Provides Meta-data for easy introspection of data types</LI>
<LI>Supports a disconnected model, whereby data can be retrieved from a data source via <A href="http://incubator.apache.org/tuscany/das-overview.html" class="external-link" rel="nofollow">Data Access Service</A>. The data can be modified by a client with change tracking, and applied back to the data source.</LI>
<LI>SDO programming model is language neutral</LI>
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<P>Tuscany implements SDO in <A href="sdo-java.html" title="SDO Java">Java</A> and in <A href="sdo-cpp.html" title="SDO CPP">C++</A>. A <A href="http://www.osoa.org/display/PHP/SOA%20PHP%20Homepage" class="external-link" rel="nofollow">PHP version of SDO</A> is also available.</P>
<P><A href="http://www.osoa.org/display/Main/Service%20Data%20Objects%20Specifications" class="external-link" rel="nofollow">SDO specification</A> can be found at the <A href="http://osoa.org/" class="external-link" rel="nofollow">Open Service Oriented Architecture website</A>. </P>
<H4><A name="SDOOverview-LearnmoreaboutSDO"></A>Learn more about SDO</H4>
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<LI><A href="http://soa.sys-con.com/read/313547.htm" class="external-link" rel="nofollow">What is SDO? Part One: The value of many of the facets of SDO</A>,Java Developer Journal, article by Kelvin Goodson & Geoffrey Winn</LI>
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<LI><A href="http://java.sys-con.com/read/358059.htm" class="external-link" rel="nofollow">What is SDO? Part 2 - A standardized approach to data programming particularly well suited to SOA</A>,Java Developer Journal, article by Kelvin Goodson & Geoffrey Winn</LI>
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<LI>Varous white papers and presentations about SDO can be found on www.osoa.org <A href="http://osoa.org/display/Main/SDO%20Resources" class="external-link" rel="nofollow">SDO resoruces page</A>.</LI>
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