Could also be specific object types in specific places or on specific layers
etc, but in my industry (architecture) drawing standards are so sloppy that
it's safe to say that this would almost NEVER WORK.
I know that other industries are different, but how consistent, I can't say.
I get drawings from say, manufacturers, and they are pretty sloppy too.
(Fudged dimensions, incorrect layering, redundant styles, etc.) I've seen
attempts to automate the production of drawings which might get around most
of this, but the next question is, "what is an acceptable margin of error
for your database extraction?". If it's near zero, I would find something
else to do.
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