2. The method of claim 1 , further comprising associating explicitly a first set of elements of the plurality of elements of the tree-structured data with explicit meta-data levels.
2. The method of claim 1 , further comprising associating explicitly a first set of elements of the plurality of elements of the tree-structured data with explicit meta-data levels. 3. The method of claim 2 , further comprising associating by inheritance a second set of elements of the plurality of elements of the tree-structured data with explicit meta-data levels of closest ancestor elements of the first set of elements.