for my application I think of support for OR and NOT when selecting
keywords from a list. The standard now is AND.
Are there any examples/models for visual support of AND-OR-NOT
I wouldn't like to have lots of graphics with arrows here and there.
I think of some kind of support with colors (groups of OR-keywords get
a unique background color, NOT-keywords of course get a red
background), supported by tree-like indents for complex structures.
BTW: Searching with google for "AND OR NOT" gives no result, just the
message, that these common words have been eliminated from the search
bookkey - Bookmarks by Keywords.
With a new way to handle a large number of keywords.