Service Data Objects for PHP extension

Hi, We've been working with Zend on a prototype of Service Data Objects for PHP. This is derived from the Java SDO 2 specification (see http://www-128.ibm.com/developerworks/library/specification/j-commonj-sdowmt/index.html ), but has been designed specifically to exploit the dynamic nature of the PHP language, akin to SimpleXML. SDO provides a single API for manipulating data from heterogeneous data sources. It also provides built-in support for optimistic concurrency by recording any changes made to a data object. This change history can then be used to detect conflicts when writing data back to a data source. In addition to the core SDO runtime extension, we have prototypes for two Data Access Services (aka Data Mediators). These provide the ability to read/write SDOs to/from data sources. The two data sources we support are relational (implemented using PDO), and XML (implemented using libxml2). We are aiming to put this code on PECL (under an Apache 2 license) as this appears to be the natural home for PHP extensions. We would love as many people as possible to play around with and test SDO once it's available and would appreciate any feedback you may have which can help us improve it. - Graham Charters, IBM Hursley Park