DTD Attribute Types - NMTOKENS

The attribute type of NMTOKENS allows the attribute value to be made up of multiple NMTOKENs, separated by a space.

Syntax:


<!ATTLIST element_name
attribute_name NMTOKENS default_value>

Example:


<!ATTLIST mountain
country NMTOKENS #REQUIRED>

Valid XML - The following XML document would be valid, as it conforms to the above DTD:


<mountains>
  <mountain country="New Zealand">
    <name>Mount Cook</name>
  </mountain>
  <mountain country="Australia">
    <name>Cradle Mountain</name>
  </mountain>
</mountains>

Invalid XML - The following XML document would be invalid because the value of the "country" attribute begins with a number (which means it's not a valid XML name):


<mountains>
  <mountain country="1a">
    <name>Mount Cook</name>
  </mountain>
  <mountain country="1b">
    <name>Cradle Mountain</name>
  </mountain>
</mountains>

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