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Example: Generate descendants depending on the parent

In this example, we want to display a set of labels for all animals except mammals which we want to display in a menu button. For this, four rules are used, the first two for containers and the other two for the leaf nodes. In the first rule, a condition filters out all animal classes that are non mammals. Those other types will fall through to the second rule. For mammals, a menu button is used. For other types, an hbox with a label in used instead.

When recursing into the leaf animal nodes, the third rule is used for mammals and the fourth rule for other types. The third rule uses a parent attribute which causes the rule to only match when the contents would be inserted into a button tag. This will only apply to the mammals since the mammals container generated a button. The others would be inserted into an hbox tag so the fourth rule is used instead. This last rule generates a label.

View   View Data Source

<vbox align="start" datasources="animals.rdf"
      ref="http://www.some-fictitious-zoo.com/all-animals"
      xmlns:animals="http://www.some-fictitious-zoo.com/rdf#">
  <template>
    <rule iscontainer="true" animals:name="Mammals">
      <button type="menu" uri="rdf:*" label="rdf:http://www.some-fictitious-zoo.com/rdf#name"/>
    </rule>
    <rule iscontainer="true">
      <hbox uri="rdf:*">
        <label class="header" value="rdf:http://www.some-fictitious-zoo.com/rdf#name"/>
      </hbox>
    </rule>
    <rule parent="button">
      <menupopup>
        <menuitem uri="rdf:*" label="rdf:http://www.some-fictitious-zoo.com/rdf#name"/>
      </menupopup>
    </rule>
    <rule>
      <label class="indent" uri="rdf:*" value="rdf:http://www.some-fictitious-zoo.com/rdf#name"/>
    </rule>
  </template>
</vbox>