Abstract: This document describes, among other things, a computer-implemented method. The method includes obtaining a structured data object that having a plurality of nodes that represent elements in the data object. One or more tables that define a table representation of the data object can be generated. The one or more tables can include a plurality of table entries that correspond to the plurality of nodes, respectively. For each of one or more first nodes from among the plurality of nodes, the method can include identifying information about one or more second nodes that are determined to be adjacent or otherwise related to the first node by performing window functions along two or more coordinate systems in the one or more tables. The window function can be centered on a particular table entry that corresponds to the first node of the data object.