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Use the arc:null keyword to check that an attribute does not exist in the specified item.

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Parameters

  • item: The item to check. If not specified, the default item is used.
  • attr: The name of the attribute to check.
  • action: The action to perform if the expression evaluates to true. Allowed values: break or continue.

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Control Attributes

None

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Example

Define missing title attributes. 
<arc:call op="fileListDir" output="out">
  <arc:null attr="filename">
    <arc:set attr="title" value="Unnamed File"/>
    <arc:else>
      <arc:set attr="title" value="[filename]"/>
    </arc:else>
  </arc:null>
  <arc:push title="[title]">
  [out.file:*] 
  </arc:push>
</arc:call>

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See Also

  • arc:else: Create a block which is executed if the condition is not satisfied.