Hello. I'm developing a dxf reader and need some more information on the Lineweight property for entities. In the dxf manual, it states for Entities that key (370) Lineweight is an enum value that is "not omitted". However I have had some files where it is not specified for each entity. So, with this, can an entity's lineweight be specified by an associated layer? or block? And if so. how? Also, and info on the enum values? I have a file with -2 and -3 for lineweights. Is there a general size for these values in autocad? Any information, thoughts, or links would be greatly appreciated. Thanks. Paul