Two fundamental distinctions separate OSS/CAD from traditional OSS data integration tools:
1. The use of semantics enables incremental and low-risk
data unification
Using ontological models, OSS now needn't be tightly
coupled with unified service model definitions. Instead, loosely
coupled systems can be joined using a shared semantic framework,
reducing the cost and complexity of any retrospective changes to
the model or the data.
2. Knowledge representation is the basis for extra
applications
Whilst existing technologies attempt to provide a unified
data federation view, they don't allow additional applications to
be added out of the box. However, OSS/CAD can be extended to add
end-to-end applications, layered over the virtual unified service
model


