The named connections between objects in the EnergyPlus idf can help to understand the structure of the simulation file. For airflow networks and HVAC systems, these connections are important to understand, but difficult to grasp.
I have used eppy and d3.js to create a network graph of an idf, http://mde.maddog.webfactional.com/en/python/idf-graph/
I would like to know; - Would this be a useful app if visitors to a webpage could upload and view an idf ? - Other than explicit reference by name, how could the idf be queried to find connections to other objects ? - what 'types' of connections would be useful to filter by i.e 'HVAC', 'geometry', 'AFN'