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<H4><A name="DAS-TuscanyDAS"></A>Tuscany DAS</H4>
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<H4><A name="DAS-WhatisDataAccessService%3F"></A>What is Data Access Service?</H4>
<P>Service Data Object(SDO) provides a uniform API for handling different types of data. Data Access Service (DAS) simplifies handling of data when interacting with the back-end data source and frees application developers from dealing with tedious and error-prone transformation between end source types and SDO Data Object Types/properties. </P>
<P>Tuscany provides implementation for different flavors of DAS in two languages, Java and C++. Please follow the link under each language to explore what is available or is in progress. We welcome your help to extend support for other back-end data source types or complete the existing solutions.</P>
<P>The following diagram illustrates a typical client interaction. The client starts by reading a graph of data and makes modifications to the graph, possibly by adding elements, and then requests the DAS to push the changes back to the data source.<BR>
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<LI><A href="http://incubator.apache.org/tuscany/RDB_DAS_white_paper_v-0.2.pdf" class="external-link" rel="nofollow">The Data Access Service: How to access relational data in terms of Service Data Objects</A>, a White Paper</LI>
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<LI><A href="http://java.sys-con.com/read/260053.htm" class="external-link" rel="nofollow">How to access relational data in terms of Service Data Objects</A>, Java Developer Journal Article by Kevin Williams</LI>
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<LI><A href="das-overview.data/RDB-DAS-Overview.pdf">Tuscany DAS Overview </A>, Kevin Williams and Luciano Resende</LI>
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<LI><A href="http://lresende.blogspot.com/" class="external-link" rel="nofollow">Luciano's blog on SDO/DAS and other SOA technologies</A></LI>
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<LI><A href="das-overview.data/das-data-services-v01.pdf">Data Service and SCA</A>, Luciano Resende</LI>
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