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However, you can accomplish the same thing with a little code and markup. For example, to create a link to another page and pass a query parameter, you can replace your PageLink component with
a standard <a> tag:

<a href="${profilePageLink}">Display Profile (w/ full details)</a>

...

  @Inject
  private PageRenderLinkSource linkSource;

  public Link getProfilePageLink()
  {
    Link link = linkSource.createPageRenderLinkWithContext(DisplayProfile.class, user);

    link.addParameteraddParameterValue("detail", "true");

    return link;
  }

... and in the DisplayProfile page:

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The @RequestParameter annotation directs Tapestry to extract the query parameter from the request and coerce it to type boolean. You can use any reasonable type for such a parameter (int, long and Date are common).

A similar technique can be used to add query parmeters to component event URLs (the type generated by the ActionLink or EventLink URLscomponents), by injecting the ComponentResources, and invoking method createEventLink().