Nested mappings

Early attempts. Nested mappings [Fuxman et al. 2006] are s-t tgds that extend the language of s-t tgds allowing the arbitrary nesting of mapping formulas within other... 

As nested mappings factor out common subexpressions, there are many benefits in their use (1) it is possible to produce more efficient translation queries by reducing the number of passes over the source (2) the generated data have less redundancy as the same data are not mapped repeatedly by s-t tgds sharing common parts. 

The air quality directive of the European commission demands maps on concentrations and exceedances in different detail. For this purpose numerical models can be used. Some model systems are already adjusted to deliver the corresponding maps. For instance, the model system M-SYS consists of three mesoscale and one microscale model areas and applies one-way-nesting for meteorology and chemistry (Trukenmiiller et al. 2004). 

In general, each class corresponds to a type in an XML schema with an element and a key. Attributes correspond to nested elements, while associations map to key references. The refactoring operation above therefore results in removing the nested element from the Employee type, creating a new type and element with a key for Department, and a key reference between the two types. An XSLT stylesheet is also generated to migrate data to ensure Department data is not lost. 

Ellgaard, L., Holtet, T.L., Moestrup, S.K., Etzerodt, M. and Thogersen, H.C. (1995). Nested sets of protein fragments and their use in epitope mapping characterization of the epitope for the S4D5 monoclonal antibody binding to receptor associated protein. J. Immunol. Meth. 180, 53-61. 

The last of the critical eight aromatic rings is phenylalanine-82, totally invariant over all 60 eukaryotic sequences and the two bacterial cytochromes whose three-dimensional structures are known. It is found nested against the heme, closing the upper left of the heme crevice as shown in Fig. 6. Although this residue was formerly believed from the two-derivative, 2.8 A resolution electron density map of horse oxidized cytochrome to be swung out and away from the heme in ferricytochrome (12-1J ), the four-derivative, 2.0 A map of tuna ferricytochrome has revealed this to be incorrect (15). In both oxidation states, phenylalanine-82 appears to lie next to the heme, and the crevice remains "closed in the sense observed in Fig. 7. 

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