What is the structure detail of Postscript Type 1 font in fonts.dir file.

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Hello
I have a postscript folder which contain ".pfb", ".afb" files and fonts.dir file which contain information about postscript fonts properties.
like "font name", "font file name", "style" etc..

Question: What does the meaning of each member of structure font properties.
Example: take first line of fonts.dir file.

a010013l.pfb -URW-Gothic L-book-r-normal--0-0-0-0-p-0-iso8859-1
Font file name.

a010013l.pfb -URW-Gothic L-book-r-normal--0-0-0-0-p-0-iso8859-1
what is URW here ?

a010013l.pfb -URW-Gothic L-book-r-normal--0-0-0-0-p-0-iso8859-1
Font name

a010013l.pfb -URW-Gothic L-book-r-normal--0-0-0-0-p-0-iso8859-1
what are "L-book-r-normal--0-0-0-0-p-0-iso8859-1" highlighted word mean and what about 0-0-0-0-p-0?

please let me know if any query or concern ?

These are the lines which is in fonts.dir files
a010013l.pfb -URW-Gothic L-book-r-normal--0-0-0-0-p-0-iso8859-1
a010013l.pfb -URW-Gothic L-book-r-normal--0-0-0-0-p-0-iso8859-2
a010015l.pfb -URW-Gothic L-demi bold-r-normal--0-0-0-0-p-0-iso8859-1
a010015l.pfb -URW-Gothic L-demi bold-r-normal--0-0-0-0-p-0-iso8859-2
a010033l.pfb -URW-Gothic L-book-o-normal--0-0-0-0-p-0-iso8859-1
a010033l.pfb -URW-Gothic L-book-o-normal--0-0-0-0-p-0-iso8859-2
a010035l.pfb -URW-Gothic L-demi bold-o-normal--0-0-0-0-p-0-iso8859-1
a010035l.pfb -URW-Gothic L-demi bold-o-normal--0-0-0-0-p-0-iso8859-2
b018012l.pfb -URW-Bookman L-light-r-normal--0-0-0-0-p-0-iso8859-1
b018012l.pfb -URW-Bookman L-light-r-normal--0-0-0-0-p-0-iso8859-2
b018015l.pfb -URW-Bookman L-demi bold-r-normal--0-0-0-0-p-0-iso8859-1
b018015l.pfb -URW-Bookman L-demi bold-r-normal--0-0-0-0-p-0-iso8859-2
b018032l.pfb -URW-Bookman L-light-i-normal--0-0-0-0-p-0-iso8859-1
b018032l.pfb -URW-Bookman L-light-i-normal--0-0-0-0-p-0-iso8859-2
b018035l.pfb -URW-Bookman L-demi bold-i-normal--0-0-0-0-p-0-iso8859-1
b018035l.pfb -URW-Bookman L-demi bold-i-normal--0-0-0-0-p-0-iso8859-2
c059013l.pfb -URW-Century Schoolbook L-medium-r-normal--0-0-0-0-p-0-iso8859-1
c059013l.pfb -URW-Century Schoolbook L-medium-r-normal--0-0-0-0-p-0-iso8859-2
c059016l.pfb -URW-Century Schoolbook L-bold-r-normal--0-0-0-0-p-0-iso8859-1
c059016l.pfb -URW-Century Schoolbook L-bold-r-normal--0-0-0-0-p-0-iso8859-2
c059033l.pfb -URW-Century Schoolbook L-medium-i-normal--0-0-0-0-p-0-iso8859-1
c059033l.pfb -URW-Century Schoolbook L-medium-i-normal--0-0-0-0-p-0-iso8859-2
c059036l.pfb -URW-Century Schoolbook L-bold-i-normal--0-0-0-0-p-0-iso8859-1
c059036l.pfb -URW-Century Schoolbook L-bold-i-normal--0-0-0-0-p-0-iso8859-2

both highlighted line are same only difference of 1 and 2 what does it mean ?

Thanks
Prashant Gupta :)