I currently can not find it. The main question from me was that all the information should be accessible for all users. 
Edit:
In the wiki is also some relevant information which maybe knowbody kowns.
http://wiki.ldraw.org/index.php?title=Which_part_type
Edit:
I like to know where we have fixed the meaning of the flags in front of the description:
_ underscore
~ tilde
= equal
I try to write it here.
MLCad will group the files by names. Therefore these flags are introduced.
= is the newest and indicates !LDRAW_ORG Part Alias
~ indicates files that should not be shown in the MLCad parts list and this is for all !LDRAW_ORG Subpart
_ indicates !LDRAW_ORG Part Physical_Colour
If there is more to say, please feel free.
Edit:
In the wiki is also some relevant information which maybe knowbody kowns.
http://wiki.ldraw.org/index.php?title=Which_part_type
Edit:
I like to know where we have fixed the meaning of the flags in front of the description:
_ underscore
~ tilde
= equal
I try to write it here.
MLCad will group the files by names. Therefore these flags are introduced.
= is the newest and indicates !LDRAW_ORG Part Alias
~ indicates files that should not be shown in the MLCad parts list and this is for all !LDRAW_ORG Subpart
_ indicates !LDRAW_ORG Part Physical_Colour
If there is more to say, please feel free.