Posted by Nicu Tofan on Mar 18, 2013; 6:19am
URL: https://forum.librecad.org/Hatching-in-Librecad-tp5707710p5707712.html

Those values look like bit values (each digit may be 0 or one, indicating the presence(1) or absence(0) of a feature).
 0 = Default; - 00000000b
 1 = External; - 00000001b
 2 = Polyline; - 00000010b
 4 = Derived; - 00000100b
 8 = Textbox; - 00001000b
16 = Outermost  - 00010000b

7 means 00000111b so a combination of External, Polyline and Derived
Not sure how familiar are you with programming, that's why I spell it out.