If you view the source code of a typical web page, you are likely to see something like this near the top:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
or
<html xmlns="http://www.w3.org/1999/xhtml" ...>Note that these are not hyperlinks; these URIs are used for identification. This is a machine-readable way to say “this is HTML”. In particular, software does not usually need to fetch these resources, and certainly does not need to fetch the same one over and over! Yet we receive a surprisingly large number of requests for such resources: up to 130 million requests per day, with periods of sustained bandwidth usage of 350Mbps, for resources that haven’t changed in years. . . [ read more W3C's Excessive DTD traffic]
If you are using a well built web content tool like Wordpress you are probably fine. If you are coding your own HTML by hand or you are providing tools that validate pages you need to check them to be sure you are not linking to www.w3.org.
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