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Service Oriented Architecture data access

and code in a heterogeneous environment. The SDO

API concepts are programming language neutral. Specifications for Java and C++ SDO can be found at the Open Service Oriented Architecture website. Within Tuscany

SDO is being implemented in Java and in C++. A PHP version of SDO is available for download from the PHP Extensions Community Library (PECL). Implementations for other languages have been mooted, e.g. Ruby.

SDO can be used to represent data structures from the presentation layer all the way through to the persistence layer.

It is a natural format for representing data on the wire in an SOA environment.

Typically in SDO a Data Access

Service (DAS) is used to access a data

source and create a disconnected data graph of SDO data objects corresponding to the data found in the data source. When a graph is modified, concise information about those modifications is summarized in the graph structure

along with the updated graph. This information can be useful for rolling back changes or for facilitating intelligent behaviour by a DAS when updating the original data source.

Resources

• Varous white papers and presentations about SDO can be found on www.osoa.org SDO resoruces page.

• What is SDO?,Java Developer Journal, article by Kelvin Goodson & Geoffrey Winn