In one general aspect, a method and system are described for generating a map data structure constructed in a tabular form. The map data structure may include a plurality of keys indicated in column headers and a plurality of lists of values indicated in rows. Each list of values may be mapped to a respective key in the plurality of key. The map data structure may be iteratively parsed for each key to generate a plurality of additional columns and additional data. The additional columns and the additional data may be rendered in an updated tabular representation as an extension of the first tabular representation in the user interface.