[Pmt-exif] "keyword=valueline" syntax [was Re: Exif and PNG]

[Glenn Randers-P. <gl...@ho...>]

At 02:48 AM 8/7/00 +0000, Adam M. Costello wrote:
>I don't think of my syntax as escaping anything; in fact the whole point
>of it is to avoid the need for anything to be escaped or quoted.
>
>Every newline character means the same thing: the end of the line.  The
>parser is always in the same state at the start of every line.
>
>Here's the entire syntax spec:  Every line has the form
>[keyword][=valueline], where either half may be missing.  If the
>valueline is present, it gets appended to the value of the most recent
>keyword you've seen.
>
>So a key/value pair is not terminated by a newline.  It's terminated by
>the appearance of the next keyword, or the end of the chunk.  Therefore
>it is not necessary to escape newlines.

I like this.  More completely, "...may be missing.  The valueline can
be empty and it can contain any characters allowed in PNG text chunks
except for the newline."

BTW: Do you mind if I copy some of our correspondence from png-list,
to place this in context?

Glenn