Freedombase uses a hierarchical tree structure, to enable multiple records from multiple tables to be output to, and returned from, one Web page at one go. This naming convention requires that System, Class and Attribute names used within Freedombase contain only letters and numbers. Other characters, such as full stops and underscores, cannot be used within Freedombase.

When connecting to existing tables, Freedombase will remove illegal characters from the System, Class and Attributes names used within Freedombase. The characters will still exist within the table and field names actually used. However, when referring to the tables and fields via Freedombase, the character and number only versions – without underscore or full stop - must be used instead. This will become more obvious once you see Freedombase connect to an existing table for the first time.