Apache Tuscany is built upon two core technologies, SCA and SDO.
What is SCA?Service Component Architecture (SCA) is a specification which describes a model for building applications and systems using a Service Oriented Architecture (SOA). If you'd like to learn more about SCA you can read the white paper.
What is SDO?Service Data Objects (SDO) is an architecture and API which provides uniform access # to and manipulation of data from heterogeneous data sources, such as relational databases, XML, and Web services. You can read the SDO Specification for Java to learn more about SDO.