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I would like a way to define a template (or something equivalent), for use on a single page, within that page.  There are times when it makes sense to define a template that will only be used on one page, for example a "row template" for a single use table.  Creating a separate template has a few disadvantages:

* When trying to examine the WikiMarkup, you have to open multiple pages to see what is going on.

* Testing the template requires saving the template every time you make a change.  You cannot just use the preview feature to see how things will be formatted.

* The history of the main page and the template are separate, so retrieving old versions can result in mismatches.

I would like instead to do something like this:

    #defineTemplate row
    |-
    | style="font-weight: bold; text-align: left" | {{{name}}}
    | style="text-align: right" | {{{age}}}
    | style="background-color: #DDD; text-align: right" | {{{salary}}}
    #endTemplate

    {|
    {{row | name="Sally" | age="25" | salary="$50,000" }}
    {{row | name="Dick" | age="30" | salary="$75,000" }}
    {{row | name="Jane" | age="35" | salary="$100,000" }}
    |}