emacs/etc/schema/xhtml-link.rnc

# Link Module

link = element link { link.attlist }
link.attlist =
  Common.attrib,
  attribute charset { Charset.datatype }?,
  attribute href { URI.datatype }?,
  attribute hreflang { LanguageCode.datatype }?,
  attribute type { ContentType.datatype }?,
  attribute rel { LinkTypes.datatype }?,
  attribute rev { LinkTypes.datatype }?,
  attribute media { MediaDesc.datatype }?
head.content &= link*