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There are a bunch of new ideas which are mostly concerned with free word order and its consequences.
Word order is left completely unspecified a priori and restricted only when needed. This can be achieved by representing word order orthogonally to constituent structure.
The constituent structure of a sentence is modeled by a dependency structures, and its word order by an additional ordering relation (on the nodes of its dependency structure).
The word ordering of a sentence is specified by word order constraints. The dependency structure of a sentence is expressed by role dependency constraints. Since both structure are interlocked, both kinds of constraints are also interlocked.
Word order constraints can be encoded by finite set constraints in Oz and then be resolved by propagation and distribution.
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