DTD Attribute Types - NMTOKEN

The attribute type of NMTOKEN restricts the attribute's value to one that is a valid XML name. That means the value must only contain digits, letters, and underscores, and they must begin with a letter or underscore. Note that they can't contain spaces.

Syntax:

<!ATTLIST element_name
attribute_name NMTOKEN default_value>

Example:

<!ATTLIST tutorial
published NMTOKEN #REQUIRED>

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

<mountains>
  <mountain country="NZ">
    <name>Mount Cook</name>
  </mountain>
  <mountain country="AU">
    <name>Cradle Mountain</name>
  </mountain>
</mountains>

Invalid XML - The following XML document would be invalid because the value of the first attribute contains a space:

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

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