http://www.w3.org/1999/xhtml
attributeGroup coreattrs

Documentation

      core attributes common to most elements
      id       document-wide unique id
      class    space separated list of classes
      style    associated style info
      title    advisory title/amplification
      

Source

<xs:attributeGroup name="coreattrs">
  <xs:attribute name="id" type="xs:ID"/>
  <xs:attribute name="class" type="xs:NMTOKENS"/>
  <xs:attribute name="style" type="StyleSheet"/>
  <xs:attribute name="title" type="Text"/>
</xs:attributeGroup>