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Details:

Two steps are required to make this happen:

In the createPage control, use the name of a page that doesn't exist. This non-existent page will usually be the "base name" of the unique name you want to create. For example:

<wiki:control type="createPage" name="Comment" />

Next, add the pageName input control to your form. Use the various page name fields to control the format of the uniquely-created page name. (See PageNameField in the help pages.) In the example below, the %U part of the pattern tells the server to add a number to the end of Comment to force the name to be unique:

<wiki:form name="foo">
  ...
  <wiki:input type="pageName" uniquePattern="Comment%U" />
</wiki:form>