Hello Moosers,

As you already know, Dennis is working on the hierarchical graph data structure and its great associated visualization in Pharo :) We have been testing his code on software systems which have an inherently hierarchical structure with low level relationships propagating up along the package structure, but also thought we would try it on a different type of hierarchical data. The two contributions (the HG data structure & the visualization) are after all independent of the domain model. 

Do you know of any data sources that have the following two properties?

1. There exists a set of relationships between low level, leaf entities

2. The low level, leaf entities can be aggregated along containment relationships

One example would be trade relationships existent between companies, can be aggregated to regions, countries, continents...  

If you are aware of such a data set, we'd offer a beer for the information :)

Cheers!

M.

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