1. A method of determining an inclusion of a data feature in a target node of a hierarchical node set on a computer having a processor, the method comprising: executing on the processor instructions configured to: identify a source node that includes the data feature; identify a candidate merge path set comprising at least one candidate merge path of related nodes linking the source node to the target node through at least one intermediate node; identify a merge path for the data feature from the source node to the target node by, for respective candidate merge paths of the candidate merge path set, determining whether the nodes of the candidate merge path include the data feature; and upon identifying a merge path comprising nodes from the source node to the target node that include the data feature, identify the target node as including the data feature.