Hole Callout text file - special characters

From the hole callout file, see the following note:


"delimiter ; breaks format into callout line 1; dimension text line 2; and
callout line 3 or more as needed"
" \ character indicates continuation of callout to next line"


Here are examples of where and how they're used:

*with nearside csink*

HOLE-BLIND(csns)=;<hw-diam> DRILL <hw-depth> DEEP;\
COSINK <MOD-DIAM><hw-nscsdia> X <hw-nscsang>, <hw-msgnearside>

*with both csinks*

HOLE-THRU(csnf)=;<hw-diam> DRILL THRU;\
COSINK <MOD-DIAM><hw-nscsdia> X <hw-nscsang>, <hw-msgnearside>;\
COSINK <MOD-DIAM><hw-fscsdia> X <hw-fscsang>, <hw-msgfarside>

*drilled and tapped thru*

TAP-THRU(tt)=;\
<hw-threadsize> <hw-threadseries> - 2B THRU

....I can't make sense of the use of these two characters at all. Sometimes
only one is at the beginning of a note, sometimes they're both there, and
sometimes neither are there. They're also used (or not used) at the ends of
indvidual lines, seemingly at random.

Do any of you understand the use of these characters, and if so could you
explain it to me? The explanation given in the calloutformat.txt file is
vague. Thanks,

Brian