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Most often, an application may just need to override a template (see Template Loading) so that a certain control renders differently. Or, an application may need to add a new template to an existing theme. Other times, you might want to create an entirely new theme, perhaps because you are building a rich set of unique and reusable templates for your organization.

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The xhtml theme provides several good examples of the "wrapping" technique. The simple theme renders the basic control. The xhtml theme "dresses up" many of the controls by adding a header and footer.

<#include "/${parameters.templateDir}/${parameters.expandTheme}/controlheader.ftl" />
<#include "/${parameters.templateDir}/simple/xxx.ftl" />
<#include "/${parameters.templateDir}/${parameters.expandTheme}/controlfooter.ftl" />

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