The <form:if-item-exists> element is used to conditionally insert data into the output document. The content of <form:if-item-exists> is processed only if the specified item appears in the replacement data.
Name: Specifies the name of the replacement data item. If one or more examples of the replacement data item exist, then the contents of the <form:if-item-exists> element are processed.
<form:if-item-exists name="post-status-message"> <tr> <td> Status message was: $post-status-message$ </td> </tr> </form:if-item-exists>
This example inserts a row into an HTML table only if there is a replacement data item named post-status-message.