acf5e740_ded_Data__DXF___DXF_Reference___Entity_name
[Group code] 1002 [Description] An extended data control string can be either "{"or "}". These braces enable applications to organize their data by subdividing the data into lists. The left brace begins a list, and the right brace terminates the most recent list. Lists can be nested. When AutoCAD reads the extended data for a particular application, it checks to ensure that braces are balanced. [Entity name] 
Control string
Extended Data [DXF - DXF Reference]
Entity name