Re: xml-parse-file and text properties

[Richard Stallman]

    It seems cleaner to me to define a property symbol (like `composition' or
    `fontified') as "necessary" to the text if it (the symbol) has a non-nil
    value for one of its properties -- say, `necessary', or `textual'.  Then
    there could be `strip-superficial-properties' that removed text properties
    whose names lacked the property.

I think that is a good idea.

Stefan convinced me that we do not need this now, but I think it would
be useful to start writing it, for installation after the release.