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DTD Attribute Types - ENTITY

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The attribute type of ENTITY is used for referring to the name of an entity you've declared in your DTD.

Syntax:

<!ATTLIST element_name
attribute_name ENTITY default_value>

Example:

<!ATTLIST mountain
photo ENTITY #IMPLIED>
<!ENTITY mt_cook_1 SYSTEM "mt_cook1.jpg">

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

<mountains>
  <mountain photo="mt_cook_1">
    <name>Mount Cook</name>
  </mountain>
  <mountain>
    <name>Cradle Mountain</name>
  </mountain>
</mountains>

Invalid XML - The following XML document would be invalid. This is because the "photo" attribute of the second element contains a value that hasn't been declared as an entity:

<mountains>
  <mountain photo="mt_cook_1">
    <name>Mount Cook</name>
  </mountain>
  <mountain photo="None">
    <name>Cradle Mountain</name>
  </mountain>
</mountains>

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