1. A computer-implemented method, comprising: performing, using a processor, a first transformation using a simplified map and a structural transformation map that maps attributes between a source system and a target system to generate simplified map data that includes source attribute and target attribute pairs; generating a document that includes combined data using the simplified map data and source system metadata containing contextual values of the source system; and performing a second transformation to generate transformed contextual metadata containing contextual values for the target system using a contextual metadata transformation map and the combined data.