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Minimized tag syntax is not allowed in XHTML on elements whose content model is empty. Example: <p /> should not be considered valid. Link to documentation on this: http://www.w3.org/TR/xhtml1/#C_3
Hello Eric, The Appendix C guidelines for XHTML 1.0 are best practices from an informative section of the specification, and are not directly related to validation. As such, they are not necessary to check in the validator. We have a specific checker for appendix C (prototype at [1]), which will eventually be integrated within the "unicorn" framework (prototype at [2]). [1] http://qa-dev.w3.org/appc/ [2] http://qa-dev.w3.org/unicorn/