Missing documentation of result tables columns

[Langlaeufer]

There is nodocumentation of any column of the tables (meaning, units ....)
The most i could guess but there are still some questions:

ways:
rule? (allways null)

ways_vertices:
eout? (allways null)
chk? (allways null)
ein? (allways null)
are this empty columns for a specific pgr function?