One of our Freebase Experts, Philip Kendall, recently built a fantastic tool for understanding Freebase schemas. Schemaviz shows types and properties within any domain you specify. Here’s the schema for one of our simpler commons domains:

Philip’s email explains what you’re seeing:

* Nodes represent types, edges represent properties.
* Reverse properties are shown in parentheses after the master property name.
* Grey edges represent hidden properties
* Blue nodes are types outside the domain being viewed, but which are linked to from the domain (the edge will be dashed if the master property is from the type outside the domain to that inside the domain)
* Red nodes represent undocumented types
* Node shapes indicate the display style of the type (ellipse: standard, rectangle: CVT, triangle: enumeration)
* All nodes are clickable to view that type

The visualisations are now built into the schema explorer.

As with all other Acre apps, the source code is available and cloneable.