We get W3C validation error after placing Scheme Data in our website which was built in XHTML.

Line 198, Column 41: there is no attribute "data-id"

<script type="IN/FollowCompany" data-id="322498" data-counter="right"></script>

(Link to the validator result)

Will changing the DTD solve this? We use,

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
  • 1
    Or just use <!DOCTYPE html> and skip the nonsense
    – AO_
    Commented Jun 17, 2014 at 13:37

1 Answer 1


The data-* attributes are defined for (X)HTML5 only.

The Microdata attributes (itemscope, itemprop, …) are defined for (X)HTML5 only.

So when you switch to (X)HTML5, you can use both of these.

If you want to keep using XHTML 1.0, you could use class instead of data-* attributes, and RDFa instead of Microdata (which requires adjusting your DOCTYPE).

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