<xs:attributeGroup name="fontStyleAttributes" >
  <xs:attribute name="font-family" use="optional">
    <xs:simpleType>
      <xs:restriction base="xs:token">
        <xs:pattern value="^[a-zA-Z ]+$"/><!-- allows spaces -->
      </xs:restriction>
    </xs:simpleType>
  </xs:attribute>
  <xs:attribute name="color" use="optional">
    <xs:simpleType>
      <xs:restriction base="xs:token">
        <xs:pattern value="^[a-zA-Z]+$"/><!-- disallows spaces -->
      </xs:restriction>
    </xs:simpleType>
  </xs:attribute>
  <xs:attribute name="bold" type="boooleanStringType" use="optional"/>
  <xs:attribute name="italic" type="boooleanStringType" use="optional"/>
</xs:attributeGroup>