Soto stands for "service oriented technology"; it will offer various tools/frameworks intented to provide building blocks for service-oriented architectures. Soto's core is a lightweigth container framework allowing to "wire" services through a convenient XML format. Soto in addition supports a "layered" logic approach: different "logic domains" (known as "layers") can be mapped on top of service instances, sparing the developer from aggregating various types of logic into unmanageable blobs - this is similar to what AOP attempts to solve, but at a higher-level: the "layer" concept needs not being implemented with byte code manipulation, advices, pointcuts, and the likes.
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