... and is in no way related to "metacharacters as defined by the w3c". If you are having a particular problem please elaborate.As pointed out by rain forest puppy
http://www.wiretrip.net/rfp/txt/phrack55.txt
All metacharacters as defined by the w3c should be escaped for security reasons. Whether it be an sql query or shell command. Even if you don't think a particular metacharacter could be used for sql injection techniques, someone will come along and prove you wrong eventually. Mysql will properly interpret all w3c metacharacters when escaped. I suspect the mysql folks understood the need for it too.
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