Types of Attributes (3)

• NMTOKEN - The characters of an NMTOKEN value must be a letter, digit, '.', '-', '_', or ':'. It may not include whitespace.

     <!ELEMENT student_name (#PCDATA)>
     <!ATTLIST student_name student_no NMTOKEN #REQUIRED>
                          
     <student_name student_no="9216735">Jo Smith</student_name>