proprietary attributes

Hi,

I'm trying to work around a warning tidy spits out for a proprietary
attribute.
That's the line in question:

<table role="presentation" summary="A summary">

and tidy prints out the following warning:
  line 45 column 9 - Warning: <table> proprietary attribute "role"

I tried to use the --drop-proprietary-attributes option but it doesn't
change anything. Even if I specify --errors it will still print the warning
message. I'm not so concerned about the warning, though, it's more because I
use tidy for automated testing and read out the exit code. So I need tidy to
exit with 0 (which it doesn't because of the proprietary attribute).

Is there anything I'm missing here?

Thanks
Erik
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