Tuscany is based on specifications defined by the Open SOA Collaboration:

• Service Component Architecture (SCA) defines technologies for creating services and assembling them into higher-order service networks. SCA provides a language-independent way to compose and deploy service networks. SCA also defines language-specific programming models for service authoring including Java, Spring, C++ , and PHP. There are currently Tuscany SCA runtimes written in Java and C+. Learn more about SCA.
• Service Data Object (SDO) provides a uniform interface for handling different forms of data, including XML documents, that can exist in a network of services and provides the mechanism for tracking changes. Apache Tuscany provides Java and C+ implementations for SDO. Learn more about SDO.
• Data Access Service (DAS) provides a simple SDO interface to relational databases. Apache Tuscany provides a Java implementation for DAS. Learn more about DAS.