The PURGE command in AutoCAD 2015 and Verticals will now purge dgn linetypes and orphaned dgn linetype data. This functionality cleans up non-essential data from DWG files that have become bloated while copying and pasting from DWGs containing DGN linetypes. Previously a Hotfix was necessary for AutoCAD 2012 as well as for AutoCAD 2013/2014 in order to remove these objects. In both cases the Hotfix required the user to use the NETLOAD command in order to load the DgnLsPurge.dll,once this .dll (Dynamic Link Library) was loaded the user had to use a separate command, DGNPURGE, which removed all unused DGN data. Unfortunately, the NETLOAD command is not available in AutoCAD LT so those users were not able to clean up their files as easily. AutoCAD LT 2015 user are now able to PURGE dgn linetypes as well.
There is a difference as to how the PURGE command removes DGN data; the hotfix's DGNPURGE command will always remove all unused dgn linetypes and orphaned dgn linetype data, giving the user no choice if they wish to keep some of the data in the file. The PURGE command in 2015 has a new "Automatically purge orphaned data" checkbox which, when checked, will remove all orphaned DGN linetype data, but it does not automatically remove all unused DGN linetypes. Full DGN linetypes are treated just like any other linetypes, the user must select which linetypes to remove. This make it possible for users that have DGN linetypes in their drawings which are not currently in use, to have the option to keep specific DGN linetypes in the drawing for future use.
Both the PURGE and -PURGE command support purging orphaned DGN linetype data as well as removing the DGN linetype data.