通过DTD IDREF显示其他属性值

Question

我的DTD文件存在问题。我做了定义：

  <definitions>
    <availableGrades>
      <gradeDefinition name="Role-Playing Game" id="RPG" />
      <gradeDefinition name="First Person Shooter" id="FPS" />
      <gradeDefinition name="Real Time Strategy" id="RTS" />
      <gradeDefinition name="Racing" id="RAC" />
      <gradeDefinition name="Sport" id="SPO" />
      <gradeDefinition name="Third Person Perspective" id="TPP" />
      <gradeDefinition name="Logic" id="LOG" />
      <gradeDefinition name="Arcade" id="ARC" />
      <gradeDefinition name="Strategy" id="STR" />
      <gradeDefinition name="Platform" id="PLA" />
      <gradeDefinition name="Adventure" id="ADV" />
      <gradeDefinition name="Fighting" id="FIG" />
      <gradeDefinition name="Simulator" id="SIM" />
      <gradeDefinition name="Other" id="OTH" />
    </availableGrades>

使用：

<game grade="FPS" />

在DTD中，我添加了IDREF：

  <!ELEMENT gradeDefinition EMPTY>
  <!ATTLIST gradeDefinition
            name NMTOKENS #REQUIRED
            id ID #REQUIRED>
  <!ATTLIST game grade IDREF #REQUIRED>

我通过CSS显示成绩属性的值（内容：attr（成绩）），但在浏览器中我看到例如FPS。可以打印“First Person Shooter”而不是“FPS”（参考gradeDefinition名称）？