G'day everyone

I'm not a Java programmer -- I'm a translator translating Java
properties files.  I lead a project to help volunteer translators
translate opensource programs into their languages, and we'd like to
translate a program that uses non-standard multilines in properties
files.

I was hoping one of you could either tell me the answer or point me to
a URL with the answer to this question:  what is the correct format
for multiple lines, and for multiple lines with line breaks, in a
properties file?

The non-standard properties file I have looks like this:

one = two three
+ four five
+ six seven

and I suspect that a standard properties file will look something like
this:

one = two three\
four five\
six seven

but I'm not 100% sure.  And what if those line breaks should be real
breaks (hard returns, CRLFs, etc)?  Do Java properties files use \n or
something similar?

Thanks in advance
Samuel Murray (leuce)